Possible park perv

Today I was at the park with my 5 yo old daughter. I noticed this older fat guy sitting by himself. What was weird was he was constantly watching these boys play. They were all from about 10-15 years old. Never moved and never talked to anyone. It really creeped me out so I called the cops and explained what I saw. About ten minutes later a cop shows up and right away she talks to him and asks him questions. I wasn't close enough to hear what was being said but eventually he called out a boys name and he came over. Apparently it was his son. While the cop was questioning him everyone in the park was watching. I looked out in the parking lot and there were 3 cop cars and they were all standing around talking. I kind of felt bad for the guy, but what if I was right and he was a perv?