There are dangers in the world, but the world is not “full of dangerous, rogue nations seeking to do harm”. Actually, it’s mostly empty of them.
Under United States law, states aren’t in charge of immigration; such matters are part the federal government’s jurisdiction. Indeed, Article 1, Section 8 of the U.S. Constitution not only declares that it is the role of the U.S. Congress to “provide for the common Defence and
Radicalism can be an ugly thing or a beautiful thing, depending on its content, but whatever it is, it isn’t the business of anyone in the federal government.