I went to UPenn and they had an enormous private police force. It may sound dystopian but it was actually awesome. Penn Police were nice, well-trained, and always looking out for the students. They did what it took to keep everyone safe in an area of Philadelphia that is not traditionally desirable.

It's also amazing to see Penn Police go from friend mode to cop mode. There were a few armed robberies on campus (non-student criminals) and the Police went from "nice guy in yellow waving on the corner" to "guns drawn behind the squad car" in seconds. They definitely saved lives every year.