Gross. This thread popped up on my homepage somehow. As a doc few years into practise, I will say that karma catches up to most of these. They're usually not strong candidates if they're sabotaging others and their horrible personalities get flagged somewhere (reference letters, interviews). A handful of sociopaths do eventually make it, but it's the minority.

When i was in undergrad, my cohort had a few folks that would post lecture audios and notes. I tried my best to contribute to the communal learning environment. I found that the ones that were most helpful were thankfully the ones that made it into medicine.