Most of the people at uni are adults, infact all!! and are entitled to do what they wish!
Lets get real! Our parents drink and still manage to earn a living for themselves and their family! Thats why uni is different from school, because it prepares us for REAL life.do you think scientists or mathematicians, physicists dont drink!!!!!
Work and play are both a part of live.At university we are not training to be priests who are supposed to abstain from alcholol and all such vices that you've quoted.we are studying to get a degree that will make us work in real world!!