I'm a junior at Temple.
Here ya go... yes, Temple is in a bad section of the city. Not the worst, but clearly not the best.
Temple has taken several steps to make their campus safer. You mentioned the police, lighting, cameras and emergency call boxes. Inn addition to that, Temple police, working with Philadelphia PD, patrol the campus and a radius of a few blocks off campus as well, since many students live off campus. They patrol in cars, on bike and by foot.
I put a link below to the campus crime statistics. You'll notice you're at a much higher risk of theft than assault - so don't leave your phone or iPod laying around. But since you're from UD, you know that already. Poke around the safety website - they have some good information on there.
My two cents - the campus itself and the immediate surrounding area are safe, but you still have to exercise common sense. Best of luck on your college search.