Arafat wasn’t a part of the Camp David Accords in 1978, you’re confused with the 2000 Camp David summit.
That 2000 summit fell apart because of a loggerhead over what is fundamental to both sides, and an Israeli negotiation redline hypocrisy - right of return. Arafat may well have been an Arab nationalist who wanted the three no’s forever and wouldn’t sign anything - but then why engage and negotiate at all? Concessions were offered from on both sides but Israel refused to permit those in the diaspora to return to their land, all while funding birthright trips for foreign Jews.
Egypt has a viable country and government, and got the canal back and A SHITLOAD of land Israel had taken. Palestinians were being offered what the US and Canada gave the First Nations after we broke treaty after treaty.