Damned good question, Trav. Damned good question.
I would love to see the U.S. develop a network of teams, intel gatherers, informants and support people in various nations across the globe that specialized in one thing only: eliminating these orcs as soon as they rear their ugly heads. Some rabid Jihadi sh!theel pops up and spouts this crap, the next day they're dead. A long-term pattern of that would curtail their activities, through fear, attrition, or both.
Have you read "The Justice Cooperative" yet? It's about a revenge system for violent criminals who just need killing.
I think websites that post terrorists names, addresses, pictures, routines etc might be a good step. They should not get safe haven in the West, to plan more terror.