How many people have watched Khan's video who otherwise wouldn't have learned shit about WWII or the Korean War. I know I learned stuff about the Korean War myself which I wouldn't have learned otherwise.

It's even harder when you're given a biased view of the facts and don't realize there might be more.

The fact that he doesn't provide -everything- has a plus side in my book: It forces them to seek out more information if they want to have an opinion.