The violence of the London Underground

Seriously, WHY is it that when one is standing on a London Underground platform, one seems to disregard all concern for manners and social etiquette? I recently saw a healthy looking young man push past a very elderly woman who was trying to get off the train. Now what on earth was this guy thinking? Would he do that anywhere else? What was worse was that he was wearing a suit, so I assumed he'd have more respect, but I guess there's just something about the tube air that makes people forget that there will be another train in two minutes and act as if there's no tomorrow with jumping on this one, right here, right now. It really isn't worth being an absolute idiot over!