The United States and its allies devote considerable financial and human resources to countering violent extremism (CVE). CVE is a central pillar of the United States’ domestic and international counterterrorism effort, following the lead of the United Kingdom’s Prevent initiative begun several years earlier. Like the United Kingdom, the United States launched its CVE enterprise in response to a perceived increase in radicalization among its Muslim citizens. The U.S. enterprise, however, lacks a clear definition, is based on flawed assumptions about what works, and its proponents have yet to question whether CVE is worth doing in the first place. The United Kingdom’s approach suffered from similar shortcomings when it was first introduced, many of which were corrected in a later program update. It is time for the United States to do the same.