Just because they didn't claim it doesn't mean they didn't support it.
But just because you want to believe if doesn't make it true either.
Why else would they ambush a cop?
For the same reason most crimes are done: drugs. The fastest way for a police officer to get shot is to stumble onto a drug deal, even a little one.
How about hundreds of people in the street chanting "Pigs in a blanket, fry'em like bacon"? You want to live in a double standard world but the world isn't letting you. Rhetoric kills according to you guys on the left and BLM has called for the killing of cops.
Did that happen once? Yes. Was it right? IMO, no and the organizers' comments that it wasn't meant to promote violence against police doesn't hold water for me. Has the BLM been routinely calling for the killing of cops? No. Is there any evidence, anyone arrested for revenge killing of police? No. Are police deaths up? No.
So your stats on guns mean nothing without a break down.
You can't randomly dismiss confirmed, real data because it doesn't fit your worldview. If you want to present data that is "broken down" to show a different picture, go for it. I'm a data guy, convince me. Just saying data is meaningless because it doesn't show how many shooters stood on one foot isn't a rebuttal.