Since the hillside is forested, we get plenty of traffic from wildlife, but I can only think of maybe once or twice that any homeless person has dared ventured through to collect cans. Despite this I'm told that there WAS a burglary, but it must have been in the 70s, because following that the management put bars over the first floor windows, which have existed for my entire lifetime.
I had two theories: leaving Golden Gate Park, you end up on Frederick street; going north gets you to Haight St which is a wonderful place to panhandle, going south gets you nowhere. The other theory is that it would have gone further south (maybe a few more blocks to Parnassus), but the Cole/Carl intersection was nice enough, and full of enough families, to push people south the second they get off of the N-Judah.
I believe Lisbon has a very low crime rate (for european standards) and my theory for more crime happening on the higher streets is pretty simple: on the bottom the streets are really big and there's lot of space while the streets on the top of the hills are really small so easier to be seen by the police when you're doing something evil.
I like thinking about these kind of relations though!
If everyone had cars, or public transit, you would probably see better property values on hills, like you do in SF.