I was a TA in Chemistry at Harvard in the early fifties. We had lots of students in those courses who also didn't belong at Harvard. We called them ill prepared, lazy, bad attitude and a bit of stupidity rolled in. Many were legacies taken to support family tradition not to mention future generous donations.. Now the 'shouldn't be there" lot come with other descriptions. Also in the fifties Harvard practiced different sorts of discrimination - racial, religious not to mention against graduates of public high schools. That kept out many students with great talent. Another matter. We did have high standards for those who did get in, even if many were incompetent.