I don't support the organization. I support the movement. The movement is older than the organization. Kinda like how you still support conservatives even though conservatives started the KKK. You're not letting the KKK stop you from supporting conservatives, are you?
The source was the police, and I do agree that police in general are rancid garbage yes. There have been multiple studies showing they've been infiltrated by white supremacist groups, though, so there's no reason to assume they would lie about white supremacists instigating this.
Yeah man, police killing white people is a problem too. It's fucking weird that you don't think so and are using this as a point of defense. If you pay attention, BLM are the ones that get upset over police killing white people while you lick boots. Just look at the police who knocked on a dude's door in Phoenix and fucking shot him. BLM was outraged, your side fucking jumped on the opportunity to taste leather.