Knowing is not understanding. There is a great difference between knowing and understanding: you can know a lot about something and not really understand it.
“Don't get me wrong - I've gone to a club. But I'd much rather be with my close friends at home or a concert, or on a trip. I'll go dancing with my grandma. She likes to cut a rug!”
“Little evil would be done in the world if evil never could be done in the name of good.”