Personally I think its not that the parties in charge don't believe that Israel haven't broken the ceasefire by shooting a child dead it's that if the ceasefire doesn't hold then Israel will kill on average 67 children each and every day. Do you rock the boat and say something and accept that if the ceasefire breaks down then the mass killings will start again? Or do you accept that Israel are going to shoot people here and there to maintain a level of fear and control over Palestinians but that is better than the alternative?
Like @SugarandSpiceandAllThingsNaice nobody truly believes executing children is ok during a ceasefire, you know that, I know that, the dogs in the street know that. But some people, for political reasons or perhaps because although they know executing children at any time but especially during a ceasefire is wrong they just don't really care, will pretend that it's just fine.
I'm just sad that even in a ceasefire Palestinians can't feel safe, I suppose it's just like life preconflict for them really isn't it except this time they are doing it with no homes, no schools, no healthcare and sadly for some no family.