Do municipal forces actually handle cases (esp. intimate partner violence) better than campus safety

http://www.nbcconnecticut.com/news/local/New-London-Police-Launch-Internal-Investigation-After-Allegations-of-Police-Brutality-397515421.html This weekend on my campus, a student went to check on someone in the next dorm after hearing cries for help. It seems domestic violence and/or attempted sexual assault had occurred. 12 police officers, both from the New London Police Department and from campus safety showed up on campus after a different bystander called 911, and failed to calm down the victim. They also arrested the student who had come to help the assault victim (the initial police log said that the sole charge was Resisting Arrest, although the NLPD's preliminary press release on FaceBook says that the charge was for Interfering with Police). The general recommendation on this site is always to call an actual police department, not campus safety, if you don't want a case (particularly intimate partner violence) swept under the rug. In this instance, a group of police officers, mostly from the city and not the college itself, reported to the scene; I can't think of any way that campus police acting alone could have handled this case any worse than the municipal police. This is an extreme instance, but it makes me wonder: is it, in general, actually better to involve real police departments rather than campus safety, as per CC conventional wisdom? Is there evidence that government police departments normally do a better job (although I have no idea what sort of evidence could be used other than anecdata)? The student and the NLPD both have posts about this on their FaceBook pages if you want to see a primary source for this particular case, but I figured it would be more appropriate to post a news article.