Your question makes no sense.
Egypt is allied with Israel and the U.S. Even if Egypt were to make concessions to support Palestinians in big ways, they'd pay for it.So they'd be scared to even think of assisting Palestinians. You need to see where the best interests lie. Get shafted by the Israel and the U.S. and have them stop their aid to Egypt, or stick as an alliance with the biggest superpowers.
Iran has been bumping heads with Israel for a long time and their interest lies in allying with proxy militant groups of same religious sects in neighbouring countries since they all see Israel as a threat and in the way of their policies. As far as they would go, is to not ever attack Israel because they will pay the biggest price. They saw what happened in Iraq.
Saddam Hussein was one of the biggest Palestinian supporters in the Middle East and the main Arab leader with balls to stand up against the U.S and Israel. It was Israeli intelligence that spearheaded the whole WMD lie. Pressured Britain and U.S. into taking the lie as a pretext to invade Iraq. We all know what happened next.
So certain neighbouring Arab countries, despite how they might see the wrong in Israel's policies, they do not want to suffer Saddam's fate. So they will tread lightly and stick to their best interests.