I forwarded the article not because the shooter was black, but because one of the victims was. We worry about Nazis who may inspire violence, but what if this guy was inspired to violence by anti police rhetoric? You even previously said that I am trying to take race out of this, which I am. You are much more focused on race than me.
As I said earlier, BLM as a group does not advocate violence, but in many cases extremists who do have used BLM as a justification, BLM has not strongly denounced this, and BLM does march side by side with people who do advocate violence. And because of this I think their message has not been effective. I would even go as far as saying it helped trump to get elected.