With your analogy, they aim to keep the "bad guys" out of all homes, which is the same thing as saying those guys can't have homes. Also the "bad guys" group you're referring to includes, like, my cousin Jake because he accidentally crashed his pushbike into a car once when he was 6, but doesn't include Adolf Hitler for some reason.

I'm glad I had the foresight to categorize my analogy as "nitpickable," otherwise I'd feel the need to defend it.