Those policemen that involves in the killing is whom to be punished and not the whole america.
This was the original problem#1, which caused a domino effect that led to problem#2.
This is the problem because election in US is coming near and i believe that there are political agenda in this cases,some politicians are pushing people to make such actions specially other races because of this sad event.
This is problem#2 right now that's happening, which led and escalated to problem#3.
Look this is looting and not protest.
This is sadly problem#3 that's still currently ongoing.