I think part of the issue is the screening and mentoring. If you just screen for the school, of course you won't get a good intern. If you accept falling asleep once, of course it will become a pattern.

My experience with people with difficult majors from top schools is they are workaholics if you pay them good money and give them real projects. If you hire a lacrosse playing English major from an ivy league, and pay substandard wages, don't expect to get the cream of the crop.