Is this theory working in the US? Do we see the social people with weapons suppressing the antisocial gangs with weapons? If you see proof for this, good. But I don't see it. Also, one downside of firearms is collateral victims.
Do you really see armed gangs terrorizing citizens somewhere in the US then? You not seeing people in the process of suppressing gangs is fine, it just means the suppression is very effective. If suppression did not exist as you imply then you'd be seeing armed gangs collecting protection money from you every week.
Yes. It's the country with the most gun ownership metrics from almost every dataset, and there's not nearly as much gun violence as you'd THINK despite that.