They see that the IDF is going to win, so they're just saying what they think the IDF wants to hear. Most of them probably would still kill Jews if given the opportunity.
Although it should have been obvious to anyone with half a brain cell that the IDF would win a ground invasion of Gaza. I see many reports on pro-Palestinian news sites that the war is going great and the IDF is being slaughtered. Being in denial of reality like that is one of the reasons the IDF wins so easily. (In previous wars when the IDF fought multiple countries simultaneously, they all lied to each other and said they were winning when they in fact had been decimated.)