Of Course they are against it. Sanction them out of existence. Get Arab states behind it and isolate them. They will never be for anything that allows Israel to exist. If Iran collapses under the weight of it sanctions, then there is a good chance they will come around
Any Palestinian leader that signs a peace treaty with Israel has signed his death warrant.
Anwar Sadat showed that even a leader of another Muslim nation that signs a peace treaty with Israel is likely to be assassinated.
The only hope for Israel is to get on with ethnically cleansing Israel of Muslims.
Islamic teaching makes it impossible for Muslims to make peace with Israel. Any leader of a Muslim nation that makes overtures of peace to Israel is committing an act of heresy that carries a death sentence.