Are you saying they didn’t happen? Or are you saying they were repudiated by the rest of BLM?
The fact that ambush killings of cops have skyrocketed since the advent of BLM is beyond dispute. BLM puts out massive amounts of anti-cop rhetoric. Not once has anyone even remotely associated with BLM said that cop lives matter, too.
When BLM comes out and says all lives matter, especially cops' lives, and repudiates the cop hate committed in its name, then maybe they’ll be worth listening to. I strongly doubt it will happen.