Schools like UTMB interview close to 1000, and accept around 200. If they truly want all 1000 students, I don't think the interview is to verify sociopathic status haha. I think that the students they interview pass the screen for academics and ECs, and now they want to know if this student can function socially, not just academically. And the chance is the majority of those they interview can. So it comes down to small things that can separate those students from the rest. This is where your application matters again. Some schools don't use stats after interviews while others do. But chances are that out of the 1000 interviewing at UTMB, a good percent of them are interviewing at other schools, so I'm sure they are all pretty qualified.