It is sad that presumably White cops have been murdered by the BLM protestors, but on another hand, there are many positives for us out of this situation;
The credibility of the cultural marxist narrative is collapsing to any White Person with half of a brain, and a rational thought process. Here in Canada BLM were guests of honour in the City of Toronto and Gay Pride. Now we have this same group engaged in murder and arguably terrorism. We always talk on this site about changing things, but thats only going to come about through a war, or some sort of armed uprising. Rioting in the streets, or blacks criminalizing law enforcement in full display of the national media is a good thing because it forces (white) people to be honest about things and leave their comfort zone. So, I think things are going to have to get a lot worse (rioting, crime, disorder) before they get better.
The great thing about this is that it forces people to confront reality and it will force White people to be honest with themselves about race and racial differences. Of course, never underestimate a liberal. A lot of whites will find a way to justify the Negroes murdering the cops, and will actually find a way to blame White people, institutional racism of Whites on Blacks, or historical oppression for the actions of Black Lives Matter.