Might it be that racism has actually increased since then? If you take the whole world into account, that may well be the case.
I don't see any body of evidence to support that conclusion. Inter-communal problems certainly persist around the world, but division by 'race' is by no means a key issue in most of them. Indeed, in many places it's completely absent.
So you deny that it took violence to end slavery in some places?
Absolutely not. In some cases it is the only option. But I will always resist the defence of violence as a principled stance - down that road lies terror. It should never be treated as something more righteous than a pragmatic measure born of necessity: something we turn to only with reluctance and regret.
My essential point here is that we should be very wary indeed of jumping into more aggressive postures by default, and especially when doing so serves the aims of our opponents more than our own.
Nobody said that controversy ought to be courted for its own sake. However, polite intellectual debate is overrated as an agent of change in the real world. Gandhi, MLK and Mandela certainly did not restrict themselves to polite debate. They were very disruptive towards the oppressors - practically rude, even.
But, and here's the crux of the matter, they were always striving to be - and thus to appear - fundamentally reasonable. It's well-established in social psychology that the most effective way to change people's minds is to appear more reasonable and coherent than those who seek to resist that change.
What Gandhi in particular argued was that violence can only impose changes that must then be sustained by continued violence. Whilst I don't think he was quite right there - in fact, my suspicion is that he held to that line because the more nuanced one is less powerful rhetorically - the essential point holds that only by changing people's minds can you achieve ends that do not require continued violence and repression to sustain them. That is to say, even if violence is unavoidable in a given moment, it is only by sticking to the reasonable approach whenever possible that we can create the conditions in which our aims can be sustained peacefully in the long run.
Liberalism has achieved much. But it has not brought about nearly everything that it set out to achieve. Institutional racism remains and is implicitly supported by liberal elements. Inequality and oppression remain perennial issues and there is no end in sight to the domination of society by moneyed interests, who have effectively side-stepped or even controlled debate. It seems clear that the liberal ideal of the public sphere is as mythical as any of the most plausible utopias you can imagine.
I agree with you entirely here, except with regards to the last sentence. The liberal idea of the public sphere is mythical only where its present conception is held up as the last word in social and political evolution. Where it's treated as a set of tools, which can be augmented or replaced as new options become available, I believe that, for the time being at least, it still has much to offer.
The mistaken assumption I face repeatedly when arguing with opponents of liberalism is that I'm committed to it as an ideology. As I try to make clear every time it's brought up, this is far from what I actually believe. To the extent that I am committed to it at all, it is only in-as-much as I see the alternatives suggested so far as offering no adequate replacement for those aspects of liberalism which promote diversity of opinion, and, thus, allow the continued generation of alternative approaches to the various issues faced by our species.
As per my comments earlier in the thread, what I regard as the most dangerous of all developments is the narrowing of our collective view to
any internally-coherent ideology. Faced by a reality too complex to be appreciated from a particular perspective, I believe it's essential that we keep looking at it from many different angles, using many different lenses, and then chewing over the results of what we find in an ongoing process of reasoned debate and discussion. Until I see viable alternatives to those aspects of liberalism which preserve a space, however imperfect, for that to happen, my support for them will continue.
Edit: Just to be absolutely clear, the need to sustain diversity of opinion does not mean that all opinions should be treated as equally valid. That view would be even more foolish than holding that one opinion is uniquely valid.