Surveil everything at all times. Surveillance Fog, which consists of nanobots that can detect terrorist activity such as using machine tools, holding sharp edged objects, or making eye contact with another person. Revoke all rights, and make sure nobody speaks about rights.

Also, for safety, encase all people in hard foam with catheters to provide nutrients and waste removal.

Monitor mental activity for signs of deviation. Correct outlier thinking at the synaptic level.

With these modest steps, terrorism can be fully eliminated, and our civilization can finally be Free From Evil.