Realistically speaking, evil with a purpose has more potential for power and destruction. It's hard to get followers if you don't even have a cause, hence why with "pure evils", you'd only be dealing with a few (if not usually just one) individuals at once.
I'd be more worried if I was told a dictator would be invading my town than if I was told a psychopath was randomly killing people in it.
America knows more about Kim and Kanye more than its own history so I'm really not surprised.
They probably pick only those who didn't know the answers, and we never get to see all those who knew the answers. I mean, even I, who never was anywhere near the USA, know the answers to those questions.
As do I. His comment reminded me of this, so I decided to might as well show it ¯\_(ツ)_/¯