I would argue it has not in fact been useful, that making it shameful hasn't reduced it, and that calling it out in death is not useful in reducing it. I think we do it because it's easier than doing something useful and it makes us feel good.
I hate bigotry as well. I encourage to do something IRL about it.
In the last 10 years, the modern black lives matter movement has triggered similar violent backlashes, with every public gathering drawing a militarized police response and hateful counter-protesters. On a policy level, even the most milquetoast corporate initiatives to consider applications and promotions from diverse candidates of equal merit are now being slandered and attacked. In education, acknowledgment of historical racial and gender inequality is under heavy censorship pressure.
It really does seem like the more effective we are at acting IRL, the greater the backlash is going to be.
There is immense value in acknowledging and learning from the mistakes of others, yes, even after their deaths.