The first purpose of any government is to protect her citizens. That alone would prohibit the importation of all muzzies.
Second, American culture and traditions are worth promoting, and that means no dilution from muzzies. Our constitutional freedoms are based on Christianity. Therefore, a good muzzie can never assimilate and become a patriotic American.
Take America’s religious traditions out of it and you will still find Imam telling muslims that they are prohibited from answering America’s call to ever go to war against a muslim nation. They are told to lie if necessary when swearing in to become a citizen. See the old AskTheImam site.