"God hath done these things."
The apocrypha to the rescue! The original (Hebrew) book of Esther was completely godless, so the genocides arranged by Esther and Mordecai
(Mardochai in the Douay-Rheims) could not be attributed to God. But the first line of the apocryphal text takes care of that: "God hath done all these things."
(Who else would be so damned nasty?) 10:4
"The Lord remembered his people."
(By having them murder thousands of people.) 10:10
"The nation of the just ... cried to God ... and they devoured the glorious."
"The nation of the just" is, of course, the Jews. They cry to God and God helps them kill everyone else. 11:9-11
"What God would do?"
(He would help the Jews kill non-Jews.) 11:12
Esther calls upon God and God softens the king's heart (so that he'd murder thousands of non-Jews). 15:3-11
The king decrees that Haman and his family shall hang; that everyone in the kingdom who wanted to kill the Jews shall be killed; that whoever refuses
to kill the people that wanted to kill Jews will be killed by sword and fire; and that everyone will celebrate the killing of the wannabe Jew killers forever. 16:10-18