Not that I don't agree that being reasonable and accommodating, even if other people are jerks, but do you honestly think that telling a bunch of people who are drinking to turn down their music is likely to have any effect? In a dorm situation of course you tell the RA, it's what they sign up for and they actually have some measure of authority and chance of tamping things down (whether or not they should call the cops is of course another matter and at least at most colleges I've been to put to their discretion, although that might be changing depending on how bad the alcohol problems are at the schools.) All he would have accomplished going over there is getting a door shut in his face, and if the cops came later they'd guess he called them and give him more crap.
At the end of the day in a dorm situation it's the responsibility of the people making the noise to consider how it's affecting others, not waiting for other people to come to them. You know you're blasting music. Who cares if the person complaining is studying for a test, just want to read in peace or pursue their hobbies? They aren't bothering anyone doing that, which can't be said for loud partying.
