It's this victim mentality that
@Aurelian pushes that will doom any community it touches.
Nobody says that innocent Black people don't get profiled or haven't gone through historical hurdles set up by white people that set them up to fail and that we can't see the effects still lingering today.
What OP is saying is that Black people have autonomy, and with that autonomy, they are doing actions that cast a negative image towards the whole community.
A single Black guy on a train carriage wilding out can radicalise 30 Japs to having negative opinions, and it doesn't stop there, as they will speak about the moment to their friends and family, further pushing the stereotype.
It's the actions of a few that ruin it for the rest.
It has to stem from a grassroots cultural movement that weeds out the trash within the community, and everything I said here can be said exactly for the Somali community.