Seems terror doesn’t pay (if it’s battled)

Appeasement types no doubt will cry that the idea of fighting terrorists merely encourages them to become terrorists, but this study suggests that if you rub out their members early and often, terrorist organizations kill fewer people. They also tend to fall into disrepute, thinning their numbers and worsening their prospects. Of course, if killing them proves to be a frustration, talking to them seems likely to embolden them, and most likely also makes the choice clearer to potential recruits more clear: Join and kill or refuse and die.