Yes, security is a legitimate concern. And, yes, we can’t rule out the possibility that a terrorist will slip in with the refugees. Among refugees admitted to the U.S. since 9/11, there has been about one arrest for terrorism offenses for every 250,000 refugees, according to the Migration Policy Institute.

Then again, by my back-of-the-envelope calculations there’s maybe a 100-times greater likelihood that, say, a Floridian will turn out to be a murderer over a 10-year period than that a refugee will attempt terrorism. So if we’re willing to allow Floridians free entry into other states, allowing Syrian refugees shouldn’t be a problem.

Let’s be real: Refugee admission is the most deeply vetted pathway into the United States. Even for Iraqis who worked as translators for our military, risking their lives to keep Americans alive and enjoying strong support of American officers, vetting can take a couple of years.

That’s why the 9/11 attackers didn’t enter the U.S. as refugees, but as students and tourists. If a terrorist group wants to attack America, it won’t wait two years to try to infiltrate as refugees. It’ll send people in as students or tourists, use fake or stolen U.S. or European passports, or just pay a human smuggler to take their terrorists across the border from Mexico or Canada.