Why did Mordechai reveal to Achashveirosh that Bigsan and Seresh wanted to kill him, what did he care? Additionally, the halachah is that by a non-Jew we say: לא מעלין ולא מורידין – “If he is in danger, we don’t try to save him”, so why here is Mordechai suddenly so worried about Achashveirosh?
The Yalkut Shimoni (Esther, remez 153) offers a number of answers. One answer he says is that Mordechai wanted Achashveirosh to remain alive, as he thought that he would be helpful in the rebuilding of the Beis HaMikdosh.
Another answer the Yalkut says, is that he thought that if Klal Yisroel needed anything, he would be able to get it from Achashveirosh.
A third answer the Yalkut says is, so that people shouldn’t say that all this time he was married to a non-Jew, and nothing happened, and suddenly he marries a Jew, and look what happens.
R’ Chaim Brisker answers, that the reason he told Achashveirosh was, because it is better that two non-Jews die then just one. If Achashveirosh would have been killed there would have been one death, however, now that Mordechai told Achashveirosh about the plan of Bigsan and Seresh, two deaths were brought about. Two is better than one.
