Agreed. I'm currently under the impression that most people cannot become rationalists even with training, but training those who do have the potential increases the chance that they will succeed. Still I think rationality cannot be taught like you might teach a university degree: A large part of it is inspiration, curiosity, hard work and wanting to become stronger. And it has to click. Just sitting in the classroom and listening to the lecturer is not enough.

Actually now that I think about it, just sitting in the classroom and listening to the lecturer for my economics degree wasn't nearly enough to gain a proper understanding either, yet that's all that most people did (aside from a cursory reading of the books of course). So maybe the problem is not limited to rationality but more about becoming really proficient at something in general.