I've come across thugs who carried BB gun pistols because they weren't allowed to buy real pistols, and they wanted to look like they were armed so their homie "friends" would think they were packing. I think they a) wanted to look "cool" to the uninformed, and b) maybe commit a little robbery/mayhem with them. Several of them got shot by cops for pointing said BB gun at the police whilst committing a crime. Good riddance.
The other day, I encountered some teenie bopper fools shooting at each other in the McDonalds parking lot with Airsoft pistols. Since we do have CCW here, this'd be a great way to get to see the muzzle end of a real gun if they were unlucky. I was real tempted to have the cops pay them a visit, but the cops around here are very slow to respond to anything but a real violent crime.
If some idiot pointed a BB gun or Airsoft gun at me, and I thought my life was in danger, bang bang.