"brainwashing tool"?
Education is "brainwashing". Until you get to the point where people are "independent thinkers" then everything you give them, all the knowledge, all the opinions etc is "brainwashing".
Now, considered that 90% of this board is incapable of "independent thinking"... you see the problem. You can't education without brainwashing.
Now, a society that is going to be united, is one where people learn the same things. They have the same sense. A society needs to decide where they're going, and if everyone's on board, it works better.