Taboos around violence for political are one of the crucial building blocks for a functioning democracy. If those taboos are broken, even for a good cause, you set a precedence that violence works. And the next cause won’t be as good. One only has to look at the lessons of the Roman Revolution that started with the murder of Grachus, and ended with an Emperor who everyone acclaimed as they were so tired of the bloodshed.
The non-violent protests of Colin Kaepernick were mocked and used to rally the other side and just weren't effective.
The problem here is not the violence, but a policing system that is so fundamentally damaged and has not been effectively reformed fast enough.
The MLK quote is trotted out pretty often, but "a riot is the language of the unheard".
Something _like_: make police leadership legally accountable for the actions of their officers. I say something _like_ this because it's in the right direction, but probably not the exact solution necessary. Another similar approach is something _like_ forbidding police unions or otherwise completely neuter them [with respect to Officer's actions].
Ideas like community service are good, but I think it's important to have clarity of approach (drop racism as the driving force and focus on accountability) and efficacy (make real changes).
This issue is very murky even to Americans, but everyone will say they know what the problem is or they will deny that there is a problem. If their description of the problem aligns with predictable political leanings, they're likely taking an emotionally driven perspective.