I agree with @VaBluebird and would add that acknowledging the reality of alcohol and drugs on campus is not the same as approval.
Last winter at an Ohio LAC a few students went just off campus to a bar, got drunk, and attempted to stagger back to their dorms. One became disoriented, fell, and froze to death. During a subsequent tour of the college last summer I asked the sophomore female tour guide if anything had changed on campus since the student’s death. She burst into tears (had been a friend of the deceased student). I felt terrible, but also felt that I needed to ask.
Since then, I guess I’ve focused less on the amount of drinking etc that occurs on any given campus, and more on the support and educational opportunities for students’ health there. Drinking, drugs, and unwanted sexual advances are all high risk situations at college, and particularly so for first year students. So I want my child to be aware of all of these risks (that’s my responsibility), make some good friends to have her back (that will be her responsibility), and go to a college that provides appropriate levels of education and support (the college’s responsibility).