Micah Meadowcraft is absolutely correct to say that it is Hamas that bears responsibility for the deaths of civilians in Gaza. This is illustrated by Hamas' refusal yesterday to accept an Egyptian brokered ceasefire which Israel accepted.
But what struck me about Micah's post was the fact that he cited the UN Relief Works Agency and quoted Pierre Krahenbuhl, its Commissioner General.
The UN has two agencies which deals with refugees - the aforementioned UN Relief Works Agency (UNRWA)which deals exclusively with Palestinian refugees and the UN Refugee Agency (a.k.a. the UN High Commissioner for Refugees) which deals with the rest of the world's refugees.