That "Blue Lives Matter" wasn't ever about caring about police lives, only a counter to Black Lives Matter. Black Lives Matter was formed because innocent black people kept being killed. Blue Lives Matter was formed because being challenged with that fact offended them.

When a police officer shoots a black man because he's intimidated by his skin color, the defense "his life matters, too" is bullshit. Since Blue Lives Matter didn't actually have anything to do with violence against police officers, it's bullshit.

Ironically, I would say Blue Lives Matter caused people to target police officers, who really hadn't been targeted before. One could argue it is more accurate that Blue Lives Matter caused more unjustified police incidents against black people, which caused more misguided vigilante-style violence against police.