Besides US cops doing all of that and worse on a depressingly regular basis, what does Russian police behaviour have to do with the decision to ban guns in a shop in the US?
I don’t want anybody bringing a weapon into my business either, especially guns as they’re the most wildly dangerous kind, and I don’t care who is carrying it. Cops are as likely to kick off and shoot someone as the next person, better to keep all weapons far, far away from my business.
If you’re a cop and you want to buy something from my business, you’re perfectly welcome, but you’ll have to leave your gun somewhere else.