Key words “seems to be”. The primary purpose is just to hang out, drink, party, but they also do philanthropy fundraising and community service. But that doesn’t make the national news.

They are in large part social clubs for the rich ruling class families to send their kids to in order to gain connections to other rich families. Which explains why they act this way and why the repercussions are so often minimal. There are other types of frats that aren’t exactly like that but this describes the bulk of them