According to the Washington Post, “[f]our men accused of planting bombs outside synagogues in the Bronx and plotting to fire missiles at military planes were convicted on Monday, in a case that was widely seen as an important test of the entrapment defense.” These most recent convictions, however, are a reminder that, someday, this could happen. We can’t always rely on incompetent terrorists. The problem is that, unlike 9/11, there will be little practical measures that can be done after the fact to mitigate the threat.