You never answered my question.
How do you tell if these guys are gun rights activists or criminals coming in to rob the place?
If you're eating in a restauarant and this jackhole walks in, how do you know he's not there to rob the place?
The answer is you don't, but according to you, we should just sit there and wonder and hope that they aren't there to commit a robbery.
I was in a supermarket one day and two guys with rifles walked in and guess what? They robbed the place.
So forgive me if I don't have as much faith as you that these are probably not criminals.