I believe that other people's are jealous of Israel's long (written) history, and it's people's unity, perserverence and tenacity.
Others are subconsciously jealous of Jew's moniker (is that the right word?) as God's "chosen" people.
In my way of thinking, the world would be much worst off both intellectually, technologically and spiritually if the Jews were not here.
Not to mention the fact that Christ could only have come from the loins of Israel.