I can't personally think of any country that is demonstrably better because of the decision that someone made that allowing immigration of Muslims was a good idea. They have no trouble killing each other over very slight religious differences. They want to kill people who draw the prophet Muhammed.
I would love for us to just leave them alone to do their thing, and not come to America to do it. They are completely incompatible with American culture. They completely hate it and reject it. They want to dramatically change the culture - they are invading, not immigrating.