Every cop does have a side arm and they are trained not to just kill but serve and protect. The real issue if people would listen is nobody looks at why they kill, or why they keep it such a secret when they do kill. Why it gets covered up and swept under the rug, and if mistakes are made why aren't there any actions taken for justice at all. That's the issue.
https://en.wikipedia.org/wiki/Death_of_Elijah_McClain
Too many cases like this should disturb anybody. All that other stuff is but a distraction from THIS ISSUE. 3 cops against a skinny 130 pound guy?