- According to the Vilna Gaon, Esther requested that Haman’s sons be hanged to make it clear that the Jews were acting in accordance with the will of the king, avoiding any future persecution. By hanging Haman’s sons, it was sign to everyone that the king approved of the Jews’ actions.
- Ohel Moshe writes that the people could have theoretically thought that Haman was hanged for attempting to kill Mordechai, the rescuer of the king. Esther wanted it to be very clear that, in actual fact, for generations that this was not some political soap opera, but rather H-Shem did all of this for the sake of the Jews.
- R’ Yehonason Eibshutz similarly demonstrates that it is not from Achashverosh, but from H-Shem.
- Interestingly, Yalkut Pisron Torah (273) writes that this group of sons were handed over to the Jews in the merit of the Jews’ keeping the mitzva (Devarim 22:6-7) of shiluach hakan (“chasing away the mother bird”).
- In the Parsha of Titzaveh, which is usually read before Purim, in the first verse (Shemos 27:20), H-Shem commands the Jewish people to make the clothing of the kohanim using the words, “es bnei Yisroel v’yik’chu.” Rabbi Yosef Freedman points out that the last letters of those four words can be rearranged to spell talui (“hanging”) and the first letters of the same words can be rearranged to spell av v’yud (“the father and ten”).
- R’ Moshe Dovid Valle notes that the ten sons of Haman, and Haman himself, hang on the tree together, and those eleven people parallel the eleven1 curses mentioned in the Torah (Devarim 27:15-26) reserved for those who do not keep H-Shem’s Law. Their hanging should remove from us these curses.
- Rabbi Yaakov Asher Sinclair (https://ohr.edu/purim/deeper_insights/3440) writes that these dead bodies needed to be hanged because the Talmud (Sanhedrin 97b) promises that Moshiach will come to the Jews even if they do not deserve him. This will occur after a wave of teshuva (“repentance”) takes us over after the evil decrees of a tyrant worse than Haman, himself.
1Added together, there are twelve curses in those verses, not eleven. See Rashi there (Devarim 27:26) that the twelfth and final of these curses is a general one that encompasses the entire Torah. Perhaps this is a reason for R’ Moshe Dovid Valle to have not included it in his calculation of the number of curses.