Trump’s travel ban is useless. Terrorists mostly come from our own back yard.

Terrorist events often involve perpetrators who are second-generation citizens of their countries. (Odd Andersen/Agence France-Presse)

Shortly after the news broke Saturday evening about a possible terrorist attack in London, President Trump tweeted: “We need to be smart, vigilant and tough. We need the courts to give us back our rights. We need the Travel Ban as an extra level of safety!”

A good deal of the judicial opposition to the Trump administration’s proposed temporary ban of citizens of six Muslim-majority countries from entering the United States has focused on the constitutionality of banning adherents of a particular religion. It makes sense, given Trump’s many public statements during the campaign about barring Muslims from coming to the States.

Less attention has focused on the question of whether the travel ban would do what it is intended to do, which is purportedly to make us

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