How you figure? Like in 1967? Israel could kick every Arab state that stepped up to the plate in a matter of weeks without our help. If those countries choose to declare war on Israel and I doubt many of them would it would be another short war.
Who said anything about all out war, Patria? The Arabs are basically cowards. They, like you, don't really care about the so-called Palestinians. They, like you, merely use their "cause" as a club to bash Israel with. It helps to distract the attention of their impoverished and downtrodden populations away from their corrupt regimes. They will not risk soldiers to fight Israel unless they are sure they can win.