So the phrase "All Lives Matters" has always rubbed me the wrong way, because it implies an alliance between all Americans, regardless of creed ethnicity or race, with bigots being outside of the norm. That is not true. The election of Donald Trump proves that white people as a demographic will just as likely ally with bigots as with minorities. I want to stress this is not meant to be an individual judgment on all white people, but as an understanding that in our current model of race relations, a minority group cannot fundamentally trust the white majority as a demographic to protect their rights. In this model of race relations, a minority can only really trust others of a similar back ground and shared experience to protect their rights because it is in their best interests to do so too. Any cooperation with white people can only be a temporary coalition based on mutually beneficial goals, rather than an alliance based on shared values.
And the sad thing is, this begins with the actions of the white demographic. Let me start you off with an example, the same example, but one where it happens in an "All Lives Matter" world, and one that happens in the real world.
In the "All Lives Matter" world, we have a bigot boss, doesn't matter how he got there, doesn't matter why he's there, he's the boss of a company, and he's a bigot. So one day he tells his hiring manager, "Don't hire black people" although let's parrot recent political language and rephrase it to "Just throw out the applications of people with inner city sounding names, we all know they won't pass the drug tests anyways". The hiring manager will say, "I'm not doing that" because he knows and the boss knows the boss can't just fire him and find someone who will.
In the real world, we have a bigoted boss who says the same thing, and the hiring manager would go along with it because he himself might agree and because he knows other people would do it.
In both cases, the hiring manager is not a significantly better person than in the other.
And in the real world, this would create the shared experience that makes a touchstone of the black experience, because there is a pattern of bosses and managers like this.
Also in the real world, if a boss decides, "Let's hire these people exclusively to give them a chance from all the places that reject them" everyone would screech reverse racism.
There's a thing you're missing here, actually. It's a pretty important thing.
Even if the hiring manager were to know that both candidates were black, Jamal is not the same as James. Jamal isn't just a black name (and also a Muslim name, adopted by American blacks), it's a
poor black name. The movement to take back the names of black Americans and make them more similar to African names did not really catch on among the black middle-to-upper class, but it did among poor blacks. It is MLK, not Malcolm X, who both caught on in white society and who had the last laugh here. Now not only do the poorer two-thirds of black people have numerous other disadvantages in life, their own names stand out and target them for discrimination!
In this "post-racial" society, non-black people actually like middle-to-upper-class black people: the ones who speak with
General American accents, rather than African American Vernacular aka Ebonics or any other southern-influenced accent, and who have "normal" names. You can tell that black people who act like middle-to-upper class white people are favored because they're
overrepresented in advertisements: black people with the "standard" General American accent appear much more often than they do in the society as a whole. I haven't actually found stats on this but I'd be shocked if it weren't the case. Lots of good white God-fearing, Trump-voting (sic) Real Americans™ are perfectly fine with black people who act and speak exactly the same as white people. It's the ones who speak all funny-like and wear their pants too low that scare/disgust said Real Americans™.
What was I doing with "all funny-like" in that last sentence? A poor imitation of the Upland Southern accent (aka South Midland, aka Greater Appalachian, etc). That accent is associated with rednecks, because rednecks do speak that accent - the people we consider rednecks originated in Appalachia and their culture spread with them - initially north, to where the jobs were in the East and Midwest, pulled by some of the same forces as the Great Migration of black people from the Deep South, but without the Jim Crow pushing force. They would eventually become identified with the white working class, and that's why people who stereotype the sorts of people who would vote for Trump poorly imitate Upland Southern accents. Of the two major Southern accents here, it's the rhotic one. You can hear it anywhere from the southern thirds of Illinois, Indiana, and Ohio down to northern Georgia and Alabama, and west-southwest to Oklahoma and Texas, predominantly in rural areas and small towns, and among older people or people of all ages without college degrees. It's not the
prestige accent of the US, but it's a little higher than Ebonics notwithstanding.
What would happen if Billy Bob (his real name) applied for the same job as Jamal and James, and those were the only three applicants? Probably, he does better than Jamal but worse than James. Maybe he gets an interview along with James, which reveals immediately that Billy Bob speaks Upland Southern and James speaks General American, while Jamal is cut entirely. James gets the job. But if James came out speaking Ebonics, then Billy Bob might get the job - he speaks a non-prestige accent, but it's not quite as non-prestigious, and management is convinced he will be easier to train than the other two.
"All Lives Matter" does not imply an alliance between all Americans. As has been posted, it is a counter-slogan that arose to undercut the claims made by the slogan "Black Lives Matter." The original implied contrast of the slogan "BLM" was "as opposed to not mattering (as would seem to be the case from the few opportunities our society provides them, harassment by the police, unequal rates of incarceration, etc.)"
So the implied contrast is "as opposed to not mattering." "All Lives Matter" reframes the implicit contrast in "BLM" to "The lives of black people matter, as opposed to the lives of people of other races." To be more succinct, it takes a slogan that asserts "Black Lives Matter" and acts as though it was asserting "Black Lives Matter," so that that slogan can be summarily dismissed.
"All Lives Matter" was never intended as an assertion that white people, like the hiring manager in your scenario, would help black people. Almost the opposite is the case. It was devised so that white people could close their ears to calls by the black community to treat them as though they matter.
My impression of "Black Lives Matter" is that it is intended to convey that black lives matter
too, so the police are not supposed to gun down black people any more often than they would gun down white people. But "Black Lives Matter Too" would not have been sufficiently confrontational for media attention, so BLM is easily the better slogan. "All Lives Matter" was coined in opposition to BLM, because BLM can be interpreted in an exclusionary way rather than an inclusionary way, and there are a lot of white people, statistically but not individually privileged relative to black people, who want included among the lives that matter. And then there are some people - probably like 15 or 20% of the population, not small but not overwhelming either - who would rather "all lives matter" be thrown up as a counter-slogan just to suppress the "black lives matter" slogan because they would rather those black lives be put in their place.
I mean, if the goal is to end up with anything grounded in reality, we might just have to accept that class, or alternately privilege, is a function of many variables, of which things like race and gender are among the most important, along with education level, parents' income, disability status, and so on. The left as it is has done itself a disservice by ignoring class except for focusing on a few of the variables that are among the most important in determining class. Class warfare never ended - in fact, it got worse from the 1970s onward.