<p>I’m not even part of Greek life (that **** is too expensive for me), but I know that not all Greek organizations are about casual sex, underage drinking, and drugs. 
Professional Greek organizations like the pre-med, pre-law, pre-engineering, etc. ones prohibit those kinds of activity in order to maintain their professional status. All the professional Greek organizations also have a set GPA standard too–one of the pre-health organizations at my school requires a 3.5 GPA to even be considered eligible for an interview during Rush Week before the biddings begin! Social Greek organizations may be like that, yes, but not professional ones. </p>
<p>Also, those people may not necessarily be stupid (though if they are always skipping classes and don’t study or do schoolwork if there are any assigned, then yeah, that’s just stupid and a waste of money). They could just be having a hard time grasping concepts the first time, or even have a documented learning disorder that prevents them from learning at the same rate as their peers! They also might have come from a high school that didn’t prepare them well in certain subjects like chemistry. Should they be deprived of a college experience because they don’t learn at the same rate as their peers/have a learning disability? No! Science majors can also put in all their efforts (going to office hours, asking questions, studying both alone and in a group, going to review sessions, etc), but still only end up with, say, a 2.5 GPA.</p>