In times of fear, men and women of reason have a responsibility to speak about facts.

I understand fear. I narrowly escaped a terrorist bomb in Colombia as a young man. Fear can make you do things you regret when you learn the facts. And in the United States now, fact-checking has been replaced by fear-mongering, hard evidence by hysteria.

Related Experts Michael Clemens Director of Migration, Displacement, and Humanitarian Policy and Senior Fellow

The US House of Representatives yesterday voted to effectively block the United States from taking in refugees from Iraq and Syria. A US senator is pushing a bill to ban refugees from 34 countries, from Indonesia to Turkey. Most US state governors have promised to reject all Syrian refugees, including women, orphaned children, and the gravely wounded. They rationalize these acts by referring to unconnected events in Paris last Friday.

Not one of these politicians has any evidence that the Paris attacks were connected to any refugee. A Syrian passport that was placed near one of the attacks is now known to be fake, purchased from a counterfeiter. It is hypothetically possible that one of the attackers may later turn out to have been a refugee, but no politician now rushing to retaliate against refugees has evidence of that.

And even if a refugee were somehow connected to the Paris attacks, that would not justify trapping tens of thousands of innocent men, women, and children in a horrific war zone. That is the moral and logical equivalent of locking up all white American men due to the actions of white American terrorist Dylann Roof. As a white American male, I have the same connection to Dylann Roof as essentially all refugees have to the actions of the twisted murderers in Paris: no connection at all.

People of reason must remember three facts.

The nation is now gripped by a wave of dangerous fear of Muslims. Candidates for the United States presidency now openly discuss banning non-Christian refugees, speak of three year-old orphaned children as a legitimate security threat, and espouse a national registry of Muslim-Americans. That last proposal is shockingly reminiscent of the US census registry that was used to imprison almost all Americans of Japanese descent without cause, or Joseph McCarthy’s “disloyalty list” used to ruin hundreds of innocent people’s lives.

These ugly ideas directly harm the US national interest, as thoughtful Republicans like Michael Gerson have pointed out. They are also a shameful betrayal of America’s values, including its 63 year-old promise to be a haven for refugees, and its 239 year-old tradition of religious tolerance.

Standing against terrorists means standing strongly for rational thought and for the common dignity of humanity. It does not mean surrendering to low instincts of hypothetical fears and hatred. America’s great institutions of tolerance and welcome survived terrorists’ attempt to poison them on September 11, 2001. That magnificent tradition can and must survive the difficult months to come.