I'm mostly with you on this one. I like mass transit. It's a fun opportunity to people-watch. What I don't like is riding with smelly and/or loud and/or violent people. I don't care how people dress, though, as long as it's not unhygienic.

I think that the reason why there is so little enforcement of any conduct rules might be more practical than political, though. To effectively enforce conduct rules would probably require there to be an extra government employee on each bus or train. The driver can't really be expected to do it, nor would it be a good idea to try to get them to split their attention in such a way.