No need to be so judgmental of OP. Several people I know who chose sub-free housing - and have a low tolerance for the drug/drinking scene - come from families that have suffered the consequences of a family member (or several) with substance addiction issues. They want to avoid an environment they know all too much about. Since you don’t know the back story on everyone who makes this choice, it would be better to assume it’s not a ‘holier than thou’ situation.