What is Purim about and why?

Shalom Rabbi Michi
From my in-depth research into the period in question of the Purim miracle, it emerges that Mordecai and Esther, like the rest of the Jews of Shushan, are among those lazy and faithless Jews who clung to exile and did not immigrate to the Land with Cyrus' declaration that fulfilled Jeremiah's prophecy… Those Jews who love exile, as they did then, have always irritated the local Gentiles (sometimes rightly so) and aroused their anger… The difference between the Holocaust and the Purim period is that during the Holocaust there was no Jew to persuade the uncircumcised Gentile… So why all this?