There's a certain type of visitor to the city that just sees it as a playground, who fails to recognize that people actually live here. The urban/suburban divide in Philadelphia is much more stark than anywhere else I've ever been. Step one foot over the city boundary and it's a different world (the Northeast part of the city is somewhat suburban in character, but that's the exception).
Beating up some people on the street is just what one does for a bit of fun in an urban playground, after all.
