It seems that most young JWs who get a college education do begin to see through the Watchtower rhetoric, but not all of them. I have known many JWs who became highly educated and earned advanced degrees while remaining just as devoted to the Watchtower as anyone. I’ve also known some people who dropped out of high school, yet were still honest-minded enough to be able to pick apart the fallacies of Watchtower doctrines.
I'm glad that you pointed this out, Jeremy C. I've observed the same thing. To finally leave the Watchtower is not always a triumph of intellect, but rather a feat of emotional courage. You're right on the money in stating that devotion to the Watchtower is much more emotional - it is why there are many otherwise bright people who stay in. It's true that higher education isn't always the silver bullet some of us think it is - some who go to college probably dismiss much of the critical thinking, evolution, and other things taught as 'tools of Satan'. Meanwhile, there are others of average education and intelligence who just see right through the Watchtower. It may be a matter of temperament rather than intelligence. A couple of Philosophy or Logic classes wouldn't hurt, though.