The Halloween terrorist attack in New York City was horrifying for many reasons. Not the least of which was the fact that this was yet another jihadist attack committed by yet another alien who had been admitted into this country through legal immigration channels. It illustrated once again why extreme vetting is needed, especially when aliens come to the United States from dangerous regions of the world where radical Islamism is rampant. In this case, the terrorist — Sayfullo Habibullaevic Saipov — came from Uzbekistan, a country where terrorism is widespread.