Not necessarily that they dont care as there are many black Americans who dont condone violence. Would you say the violence is NECESSARY to force the government to reform the police and their practices as well as actually give them legit punishment and jail time or in other words, revoke their "get out of jail free card?" I feel the police feel too protected, are poorly trained and have low regard of life. There have been plenty of riots over the years and still and no change after. How effective is it?
I found this list while doing some research on Tulsa earlier today;
https://en.wikipedia.org/wiki/List_of_ethnic_riots#United_States
America has had so many race riots in the last 300 years it needs to be grouped by periods in time.
This is the type of thing that isn't taught in schools. How many Americans are aware of even 10% of these riots?
Also don't forget that the original American police force was set up as 'Slave Patrol' - their police was birthed out of racism.
The entire country is the living embodiment of white supremacy, violence & inequality. You can't fight fairly with an enemy like that.
So to answer your question, is violence necessary? At this point, it looks like it - but it would need to be targeted & organised.
Maybe 100 years ago there could've been a better solution, such as black people spending money at black businesses exclusively - in 2020 that's just impossible. I do think there's merit in a long-term, sustained mass scale economic drought for a lot of companies, black people are big spenders & as we've seen with Covid, America cares more about money than even the health & safety of it's own citizens. But that's never going to happen now.
In terms of effectiveness, I would say it's better than doing nothing because America isn't going to provide equality to black people on its own accord, otherwise reparations would've already been issued.
I think there are many ideas about things that could be done, but I don't see the point in discussing hypothetical situations that involve massive investment from a corrupt government.