I would think the existence and behavior of Israel, which is so much like many other ethnically-based states -- full of hatred and violence verging on genocide -- would be reassuring to the world: they're like us! And so would contribute to a decrease in anti-Semitism.
It was when Jews were a people without a land, "cosmopolitan", literate, urban and urbane, that they were most widely hated and most vigorously persecuted.
As Stalin is said to have said, "It is precisely the innocent who are the most guilty."