Plus us as individuals can’t determine what other large groups can and cannot have. We don’t have the same life experiences.

Us as a collective do so all the time. It is a totally normal activity in a society. Nations other than the USA have successfully done this with guns. There is no reason the USA could not do the same except will power.

The rest of your paranoid what-if scenarios are not a valid reason for everyone to have access to unlimited firepower.