Both book learning and street smarts have their place. RL is not all-knowing, he's not even intelligent, but he sure is smart.
I believe that you have assumed a great deal in this statement.
One does not need to attend school to become "educated." Once a person learns to read and listen, he/she is totally capable of educating him/herself.
Further, you have no idea whether or not Rush--or anyone else--has studied science or the humanities. In fact, none of us knows what any one of the others of us has studied.
In my opinion, it is an elitist attitude which causes people to make claims about the individual educations of others.
I find it humorous that, in your post, you are opining about whether or not a person has been educated.