If you had been on the bus, and some guy pushed a girl's head in his lap, that bus would have stopped and both participants (if she was willing) would have been warned by the bus driver, or maybe even kicked off if it was not the first offense.
This has obviously been let to get out of hand. If people had been disciplined (i.e. refused bus privilages or been suspended), this could have been taken care of. The change is not in man's capacity to act immorally, it is in our reluctance to enforce discipline.
You cannot legislate morality, but you can punish unacceptable behavior.
I agree, in part. The raw capacity to act immorally can be traced to the Fall. But social morality waxes and wanes. The points that I'm trying to make are twofold. First, social morality isn't just waning, it's collapsing. Secondly, bus BJs haven't arisen because of a lack of discipline on the bus, but because children raised in an amoral environment (school/media/arts) have accepted the idea that bus BJs are normative, or at least within the pale. Even back in the Zep/Alice Cooper/Black Sabbath years, this kind of thing was unimaginable.