Funny how many here cannot grasp the fact that the photo depicts only combat age men. These are your terrorists. Without a uniform the Israelis will not shoot until fired upon.
Every man in north Gaza can reasonably be presumed to be a hostile combatant by now. The absence of uniforms is an aggravating factor rather than a restraint under the so-called "law of war".
Not that it really matters. The "law of war" is written by the victors and imposed upon the vanquished. At best it is a subtle negotiation between rival forces to minimize the cost of war in casualties and collateral damage for both sides.
The only reason for restrictive Rules of Engagement is to allow for the soldiers to possibly go home after the war to wives, girlfriends, boyfriends, and relatives with some chance of fitting back into a life during peacetime.
War is sometimes necessary. War is always horrible. It changes people in unexpected ways, and permanently so. Best we do not become fond of it.