I would certainly argue that fraternities and sororities are an immutable part of American higher education. Being that they’ve been around since 1776, they predate practically every other collegiate tradition. (You may be familiar with the first fraternity, which sort of dropped the social aspect and became an honorary organization - Phi Beta Kappa.)
Fraternities and sororities served to support a lot of groups that were excluded from campus life, namely African Americans and Jews. When these populations started to attend predominantly White colleges in numbers, the groups sprung up. Today there are Greek organizations for Latino students, Asian students, and even gay and lesbian students. Personally I think it’s a neat social phenomenon. And before someone decries the social exclusion aspect, if you are experienced in Greek organizations you can find White guys in Black frats, gentiles in Jewish sororities, etc. Obviously some groups have a lot of work to do in this area, but I can certainly attest to the fact that many frats/sororities are actively recruiting underrepresented groups in their organizations, but let’s face it - things like dues (some houses are like $5000/year!) and being a token are big impediments.
I agree with the posters that suggest that fraternities are easy targets because of their organized nature. You will find egregious examples of hazing, binge drinking, sexual assault, vandalism, etc. in bands, sports teams, and even in informal social groups. Sure, some members behave horribly, and groupthink exists in a lot of the houses, but you’ll often find some of the most active and intelligent students in the Greek system as well.
The media plays into this quite a bit. My fraternity outlawed pledging and hazing years ago, but people watched School Daze and wanted to be pledged - even though the old guys often didn’t experience it. My frat has graduate chapters as well, which means that a lot of the people with influence and money in the organization entered as grown men with jobs, rather than rambunctious 18 year olds. Obviously that’s a source of friction.
Here at Harvard they have the house system as well, but there are plenty of clubs that operate like fraternities. Finals and eating clubs, for instance. And lots of the clubs have complicated traditions and interesting entry requirements.
There aren’t many organizations that provide the leadership opportunities and the scale of the Greek system. Most organizations have philanthropic projects on a national level, and a 20 year-old might be responsible for the chapter, district, or state project. Those stories don’t get much press, but virtually every chapter in good standing does this work.
I’m not a Greek apologist - certainly there are tons of problems in the system and they have their fair share of idiots and meatheads - but I think it’s so lazy to simply think the way to curb binge drinking, violence, etc. is banning fraternities. Again, these activities happen in many kinds of organizations - there’s definitely an image problem with Greek-letter organizations and media outlets love hazing/binge drinking stories, while fights and near-death alcohol poisoning happens in every dorm on every campus weekly. (Trust me, I worked in student affairs and campus life at five different campuses.)