Well obviously all colleges radicalize students to the left, which is why they want to get rid of college entirely. Public education as a whole radicalizes people to the left so they want to get rid of that too, so that it's too expensive for most people to send their kids to school.

"College educated voters tend to vote for democrats" and "colleges radicalize students to the left" are two different things. The claim is not that this person was more likely to vote for Harris than Trump. The claim is that university convinced him to murder people.