Various governments including Lebanon and now Syria don't have the means, sometimes the will, but definately lack the means, to overcome terrorists operating on and through their soil.

"Deterrance" is to me a useless term here. Suppression, permanently, via NATO forces replaced ASAP by native local troops we are supposed to be training up, for permanent maintenance of law and order, long term suppression by force of arms, concurrently by a jobs and construction program that generates economic benefits never before available to the locals.