It was more an aside noting how common DV is, far more common than mass shootings akin to the type that sparked this thread, yet basically won't make national headlines despite that they're more typical and have a larger death count (exceptions for famous people).
It really comes down to how much we care about the deaths vs controlling people. That's the bottom-line equation regardless of political stance. It'd be nice if we had a less noisy way to project "this level of legislation can expect that many deaths to guns on average", and it at least seems like we should have access to information to make this kind of estimate.
In reality, people don't care about the deaths as much as they like to signal that they care. If they really cared, these mass shootings wouldn't be a major point of emphasis. It's not that they aren't tragedies, it's that there are many more tragedies happening constantly at a much larger scale that don't even make the news/get considered. To me, pushing legislation emphasizing tragedies where year to year the death count is in the hundreds and then ignore death counts in the 1000's+ from a wide range of sources signals that the politicians/media in question care more about signaling than they do actual tragedy.
It's similar to the visceral reaction to 9/11, where its victims are glorified while many other brave/nice/great people who didn't deserve to die remain forever anonymous. I'm sure we have our own guesses as to why that is, but the reason can't reasonably be described as "tragedy aversion", that's for sure.
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Is it really correct to call these "spontaneous mass murders"? Some are, but some it seems are planned in advance to a significant extent.