Should missionaries and jehovas witnesses be illegal?

Put up "no trespassing" signs and they will respect that and not bother you. As far as making them illegal, well, Jehovah's Witnesses were illegal in Germany under Hitler. They were slaughtered in the camps right along with the Jews. I certainly hope you are not proposing a return to the philosophy of the Third Reich and their "unpopular religions should be illegalized" view and instead just did not really think the entire thing through as much as you probably should have.