I rode in PP 2-3 days a week between 1999 and 2003, and I've also walked ALL over it (you don't get to see the nicest parts from the bike loop). Never saw a single crime incident, and the only person I've ever met who was a victim of one had it occur in the early 70s. There's no crime wave - if there was the Post would be all over it. I will say though that one maybe should be careful about hiking deep into the center of the park, and not do that at night.