Atlas I'm going to disagree with you - You don't need to be mentally ill to commit acts of terrorism, you simply need to believe what you're doing is right. Many terrorists are mentally sane (not schizophrenics, psychopaths or bipolar, etc). If you interview Islamic terrorists you'll notice it's all about religion and what they believe, they think what they're doing is correct and saving the world. There's not mental illness unless you have evidence -
Whoever fights monsters should see to it that in the process he does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you