This article pretty much sums up my opinion on this:
This man’s opinion: Mullen and staff are 5-for-5
Though I agree that the vetting process needs to be refined, stupid decisions in the heat of the moment by 18-22 year old kids are a risk at every program and there is only so much a head coach can do to prevent this type of thing when these kids are on their own. This is especially true when you consider that a lot of these kids come from rough backgrounds and have also often lived entitled lives prior to college having been stud football players throughout their playing days prior to arriving on campus. It also doesn't help at all that coaches now have their time with players so restricted.
Given all of these factors, the most effective prevention model available is to make it clear that these types of incidents are not going to be tolerated on this team. I think it sends a pretty strong message in that direction when the 5 incidents against women, even with no charges officially filed, ended up with 5 dismissals especially when that group includes a member of the coaching staff.
As Mullen says, decision making is the key. Hopefully this type of consistent response will help drive it into the heads of these kids to think of the consequences before acting when they feel "provoked" by a woman going forward.