Israel is surrounded by people who dislike them.
Anyway, The Guy is devious if nothing else, and not in the good way. He has disguised/relocated his main army every time that one of the UN Officials come snooping around, so as to create the illusion that he is a good leader. When the officials leave, then he puts back the bulk of his army, and then demolishes whatever his targets are.
Executing their captives may be the only thing they can really do with them, considering that they have to keep relocating, and prisoners would know were they are positioned, and if they escape, the rebel's could be wiped out.
Personally, I think that there is too much bloodshed over there that doesn't have to be. Too many (innocent) civilians killed.
~Krill11