Within hours of the creation of Israel, they were attacked on all sides. They fought a bloody war that cost them several percent of their total population. They were attacked again in the 1950s, again in 1967, again in 1973, and countless other times via state sponsored terrorism. That kind of history hardly makes for kind attitudes towards the attackers.

Had the Germans and Japanese continued to attack US and Allied occupation forces following their surrender, you can rest assured that the history of the last 55+ years would've been very different. Point of fact, there were some hardcore Nazi zealots who kept fighting even after the surrender. They were summarily executed, including some as young as 15, as were many of the concentration camp guards like these at Dachau.