This point is important. The police can't police themselves, and for a lasting solution to this problem to emerge there'll have to be major structural changes to the way police oversight and review is carried out.
I hope these protests are a turning point that'll lead to such reforms, but I suspect no significant changes will occur. Hopefully I'll be proven wrong.
Protests might have been unorganized, but riots most certainly are organized. Torching a police car carries a minimum 5 year sentence. It's not the protesters who are doing that.
Moreover, it is still being "organized". Someone keeps dropping off pallets with bricks. There are agitator leaflets all over twitter. People have been recorded on video handing out cash to "protesters" from a thick wad of bills. Someone is organizing and funding the riots.