They in particular used his "'take no prisoners, '0' tolerance" attitude toward the minority communities' endemic crime to paint him as ....gasp .... racist! Can't have that. Not at this cocktail party or gallery opening!
At his age and mine, the idea of a 'Black Hero' is rather more like Booker T. Washington, Louis Armstrong, or Jackie Robinson, than Al Sharpton, the Garner crook, the Trayvon thug, or the Gentle Giant of Ferguson.
I don't know about a comeback in NYC. NYC's élites like clean safe streets, but they desperately need Leftist boolshiite even more. They are largely immune to danger as they live in the equivalent of gated communities, have personal security on many levels, and do not use public transportation much. The city turns into Lagos around them, but hey, they're safe.
BTW, why hasn't Al Sharpton been charged with inciting to riot?