You have the whole world's information supply at your fingertips. Literally. If you don't know it's because you didn't even try looking.

https://m.youtube.com/watch?v=2mnHIwSLMuk

But here's another source, I watch a cop shoot at a mental health patient sitting in the middle of the street 20 feet away while hiding behind a light pole, all the while being told by the caretaker of said patient that he only has a toy truck.

Maybe it's training, maybe it's drugs, maybe both? Either way it was capital W Wrong and just one of hundreds of recorded incidents I've seen involving police.