The PA thinks that whatever Israel will leave them when they're done stealing land will be more than what they'll get fighting against the worldwide conspiracy. They actually believe that if all groups in Palestine had agreed to one of the past agreements and it went smoothly, they'd have proper borders and live relatively peacefully neighboring Israel, even with everything going on with countries Israel considers established, sovereign countries.
I wouldn't be surprised if a lot of them think what they're doing is right, noble, and in the best interest of the whiny ungrateful fighters.
S