The incident with the homeless man: as far as I understand it, this man was a nuisance, who would get the cops called on him routinely for yelling and walking in circles and talking to himself. He was having an especial instance of these behaviors and needed to be restrained. We have a fair number of people like this downtown. So SOP in restraining the nuisance perp would be to pin him to the ground. The official report says that he died of a drug overdose, but several people said that his head hit the pavement hard enough to make a loud sound and bounce off of it.
In the case of Andre and Bryson, they were charged with assault while Ryan Donald was not. In the case of the homeless man at the transit center, I don't know of any official inquiries, but this is not for lack of trying.
You can use Google. I don't have the photo of the shot-out window handy but I can get it if you want.
If you aren't a criminal, I'm not sure what you are worried about.
So many people have been criticized for this "if you're a good citizen you have nothing to hide" bullshit on