I think it's pretty obvious why it's true. Higher education challenges your ideas. Before you learn (in college) what communism is, it's just something you know is *bad.* In college you learn what it really is, and can then decide for yourself if it is really *bad.* Before college, your only bible studies are in church -- in college you break the bible apart and analyze it as a book. College teaches you that there are arguments against most ideas.
Higher education challenges your learning up to that time. Some come away still having the same basic beliefs, but many do not.
I'm not saying liberals don't hold to some conservative beliefs, and I'm not saying that all conservative thought is not derived from higher learning. I'm just saying that some of the core differences are things that get fleshed out by academia.
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