Unconscious Woman Gassed in Ferguson
Not only did they tell the group to just drop the woman--who might have been having a heart attack, according to protesters in the video--on the ground in the middle of a tear gas cloud, but watch the dude pop off a full magazine of "less lethal rounds" directly into the crowd at point blank range. And points for firing flashbangs into a smoke cloud, where you can't see anyone... those things explode. They're incredibly lucky no one was set on fire or otherwise seriously injured from that.
They didn't even allow the woman's son to remain with her. They tear gassed a group bringing them a clear medical emergency, then expected the woman's family to trust them to take care of her just because they said they would "get her."

I've known for a long time that I hated the police with good reason; it's time people stop defending them as having "bad apples" and understand this shit. Fuck the police.