Since perhaps the 1970s, I believe that most campus police forces have had one primary mission: Keep students out of the hands of local police, particularly on drug offenses. Sure, they need to keep order and prevent property damage and break up fights and such, but underlying all of this has been a desire to keep any resulting discipline internal, to shield students from the local police force and criminal justice system that likely would be much harsher (particularly in some towns where there is substantial tension between town and gown).
By the way, none of this is particularly new. You can read accounts from the middle ages about townies complaining that universities were sheltering their students from local justice (in those days students often carried some sort of clerical status in order to make them inviolate from local resident reprisal and to keep them out of the local justice system).
So given a mission to protect students from their own stupidity and from the harsher justice outside of campus, many campus police forces are entirely unprepared to handle true felonies with victims, such as forcible sexual assault. The fact that campuses have been accused of burying these charges and covering them up is not surprising -- this is what campus police forces have been trained to do.
Unfortunately, the emerging solution of stripping male campus members of equal protection and due process rights is a horrible solution to this problem. The right solution was to put these crimes in the hands of professionals outside of campus who are trained to deal with them.