Yes, but you have to admit that we're doing it pathologically now. What principles oblige us to take in people who openly declare their hatred for us, and that they want our demise ? For example, it's one thing to speak out in support of Palestine and it's another to say "France will become a muslim country in the next decade and there's nothing you can do to stop it". Or that they're here to take revenge on France for perceived oppression during the colonial era. This should have no place in polite society.

Being a sovereign country is a principle and it is enough.