It led to him being killed because in the end there was a lack of actual mass movement, and his executors quickly improved the domestic situation, ergo they won out.

would you like to see the police beat people up?
Such a situation would lead to an increase in "racist" groups like the NBPP, so yes. If there was a state of emergency declared in New York right now and the police started beating up every minority they saw, then I doubt Jesse Jackson and Al Sharpton could go in there and preach reconciliation. Radical groups would inevitably form and when radical groups form and get popular in a deteriorating situation they get angry and when they get angry they start a revolution of some sort.