This was in the 80s, so I don't know if it's changed (I doubt it)
It has. My younger cousin goes there and she's renting a off campus with a few other girls. It's not the safest place in the world, but it's much better than it used to be. Some parts of Philly have been undergoing quite a bit of revitalization lately, thanks (at least in part) to a tax credit that provides an incentive to rehab old buildings and build new ones.
So no, I'll pass on living in downtown Philly, thanks.
Temple is in North Philly, which isn't part of the city center, (the aptly named Center City). I've been living in Philly for a few years, and never felt the slightest bit unsafe walking around in Center City, even late at night. That being said, it's still a city that had near 2 million people living in it at one time, and now has about 1.5. Razing some of the blighted areas sounds like a pretty good idea.
The universe does not have laws -- it has habits, and habits can be broken.