The Jewish response to Haman's story does not call for vengeance.
It wants to assure that these events will never be forgotten.
The past is to serve as a warning for the future, even at times when reality seems to have completely changed.
And on Purim we do the same things we did during the time of Haman:
We forge ties among Jews by giving to the poor and by sending gifts to our friends.
Finally, there is our reaction to anti-Semitism itself: we laugh.
–Rabbi Adin Steinsaltz
From an essay, "Purim A Memorial Day for Anti-Semitism" by Rabbi Adin Steinsaltz