They used to have "open carry" in California. Then a bunch of people got into pushing the envelope, open carrying in ways that alarmed people, and California passed AB 144 banning open carry as of Jan 2012.
Here in PA, we have open carry. I like the fact, but mainly so that I'm covered in case I'm carrying concealed and my t-shirt rides up so that it's momentarily visible and some old lady freaks.
I guess it was bad not to leave the lunch counter and not move to the back of the bus.