When I see someone weaving about in traffic and travelling at a high rate of speed I do not attempt to stop their vIehicle nor run it off the road. I put this in the same category. If I were drinking in a biker bar, whether or not I was a member I understand there is some risks involved.
In MT it's illegal for a non LEO to take a weapon in a bar and drilled into every CCW class taught. By weapon I assume a gun even if I have other items I can use as a weapon. #2 pencil, belt, etc.

__________________
Front sight and squeeze