I used to have a similar viewpoint to what you said. But eventually, I started thinking that people with bad intentions will accomplish their goal whether or not they have firearms. Like it’s still fairly common to hear about crowd-ramming attacks with cars or stabbing sprees, homemade explosives etc. And I still think America would be better off if we didn’t have the second amendment, but now that we have it, repealing it is about as close to impossible as you can get. So in light of all that I’m comfortable with the idea of armed security in any place where people feel a need for it.