How are people supposed to take public transit when so many cities/states are banning a constitutionally protected basic human right on public transit? Its common to carry a gun on you everywhere and of all the places that could be dangerous, mass transit is probably at the top due to the type of "people" who use in in the USA. To say nothing of the fact that if you can't have a gun on public transit, then you can't have it at your destination.
I think this is a major barrier to getting people to use public transit in the USA