It seems problematic that Achashverosh gave Haman’s property to Esther since the Mechilta (on Shemos 17:14) says Amalek – of which Haman descended – is to be completely destroyed together with its property, so nobody should ever say they gained from Amalek.
Esther may have been allowed Haman’s property because the Rabbeinu Bachya (on Bishalach) answers that this Mechilta only refers to possessions obtained in the course of war.
In Vedibarta Bam, Rabbi Bogamilsky points out from the Talmud (Sanhedrin 48b) that such property actually belongs to Achashverosh.
Similarly, the Talmud (Gittin 38a) teaches that the Jews were allowed the possessions of Moav and Amon because Sichon had already conquered them previously.
Given that Esther was allowed Haman’s property, the Alshich writes that Achashverosh gave it to her because the kingdom did not need Haman’s house, after all. This is especially true if Haman destroyed his own home by utilizing its crossbeam in the building of his gallows.
The Alshich adds that the decree to kill out the Jews had not yet been revoked, and Achashverosh wanted to show that Esther and Mordechai were exempt.
On the other hand, the Yad HaMelech says that the king did this so that those who knew of the decree would not harm the Jews, effectively annulling the decree.
The M’nos HaLevi explains that Achashverosh gave her the property to reassure Esther, that although she had seen him angry that day, the anger was not directed at her.
The Malbim writes that this was Haman’s property, which should belong to Achashverosh after his rebellious behavior. However, in a continued effort to salvage his honor, Achashverosh wanted to show that Haman was really going against the queen and her people. Accordingly, the verse emphasizes that Haman was the tzorer (“antagonizer”) of the Yehudim.
The Ginzei HaMelech explains that Achashverosh’s main concern was his security, especially around Haman’s presumed allies. He therefore said Haman tried to seduce the queen, and therefore owed her money. A similar incident occurred when Avimelech took Sarah, and then gave Avraham money (Bireishis 20:14) as a testament of Sarah’s virtue.
The Vilna Gaon quotes a verse (Koheles 2:26) that a person who deserves H-Shem’s Pleasure receives wisdom, intelligent, and joy, but a sinner must constantly accumulate. The Talmud (Megillah 10b) says that this verse applies to Mordechai because the wicked Haman accrued the very wealth through which the righteous prospered.
The Maharal asks why the righteous should prosper from the efforts of the wicked. After all, should the righteous not prosper from their own efforts? He answers that the wicked work and work tirelessly to gain more wealth because they are never satisfied. The righteous are easily satisfied, so they do not have to go through the grunt work of acquiring wealth.
R’ Dovid Feinstein explains this as yet another example of mida kineged mida “measure for measure” because Haman wanted to take what was most precious to Esther – the lives of her people. Therefore, he lost what was most precious to him – his money.
The Me’am Loez says that another example of mida kineged mida is that since Haman wanted to hang Mordechai in his house, Haman’s hanging occurred in what is now Mordechai’s house.
Rebbetzin Tzipporah Heller adds that Achashverosh took the property because Haman was Mordechai’s slave. According to Jewish law, the property always really belonged to Haman’s master, Mordechai. With the property comes Haman’s identity. She suggests that taking over someone’s identity is another reason for the custom to masquerade on Purim.
The Alshich says that the nation refers specifically to Benyamin, Mordechai’s ancestor.
According to the Talmud (Megillah 13b), the nation to which Haman aims his hatred is the rabbis – the elite leadership of the nation. M’nos HaLevi tells us that killing the rabbis would leave the Jews as sheep without a shepherd. The Jewish nation cannot survive without Torah leadership. The Yad HaMelech says Haman did not want to kill out the Jews, but only wanted to kill out the rabbis. His intent would be to enrage the Jews over the death of the rabbis, and blame Mordechai. They would then kill Mordechai, themselves. Haman believed that, this way, they would deserve to be wiped out by H-Shem. This idea of causing the Jews to deserve their own destruction is nothing new. Both Bilaam and Haman attempted just such a strategy in the incident of the daughters of Moav (Bamidbar 25:1-3) and Achashverosh’s party (Esther 1:1-10), respectively.
Why such hatred? Why did Haman so want to kill out the Jews? The Malbim and Akeidas Yitzchak posit that, since Mordechai refused to bow to him on religious grounds, Haman desired the death of that nation that followed those self-same tenets.
In his Vedibarta Bam on Megillas Esther, Rabbi Bogomilsky brings that Haman realized that all of the Yehudim were an “am Mordechai” – a nation of Mordechais. Even if Haman were to eliminate that Mordechai who won’t bow to him, there will be other “Mordechais” who will pop up to do the same.
Rabbi Yitzchak Blazer asks why, if Haman wanted everyone to bow to him, did he not simply decree that Mordechai have to do it. Seeing their leader doing so should inspire most people to ape that behavior. Rav Blazer answers that Jews are different. If we see our leader acting contrary to our beliefs, we feel disgusted by that leader, and want nothing to do with him.
According to the Ben Ish Chai, he wanted to kill the Jews due to his slave status. As his master, Mordechai could take possession over everything Haman owned. With Mordechai dead, a relative or other heir would become lord over Haman’s assets, leaving him virtually powerless. As long as there is a Jew alive, Haman could not have power. Power-hungry to his core, Haman needed to be rid of all possible heirs to Mordechai’s property, and this included all of the Jews.