To avert terror intentions, one has to forget politics and politicians and work the problem with the right tools. Impossible? see the Swiss referendum system and its belated results.
Following the attack of Pearl Harbor, all origins of attacker culture, including second generation US citizens with DOD secret clearance were put into camps. Discriminatory profiling par excellance, but effective mitigation of the problem.
Is the terror wave profilable? ask yourselves, then use the tools and you are essentially done.
Another alternative is to keep waiting for the dwarf to put his bomb together, and see the outcome- terror will largely disappear for decades off the face of the earth.