Purim 5786 - "על־שם הפור"

On Monday night, we will begin Purim, a חג that, at least at first glance, seems to commemorate the events and miracles that took place 2400 years ago in שושן. Unlike חנוכה, this חג has a ספר in מגלת אסתר :תנ”ך. There, we are given the reasoning behind the name ‘פורים’. The פסוק states: “על־כן קראו לימים האלה פורים על־שם הפור על־כן על־כל־דברי האגרת הזאת ומה־ראו על־ככה ומה הגיע אליהם - Therefore, they called these days Purim after the name Pur, therefore because of the words of this letter and what they had seen concerning this, and what had befallen them.” The naming of פורים is puzzling, and leaves us with many questions: Why is the holiday named after a פור rather than the downfall of המן, reversal of אחשורוש’s decree, or the heroism of מרדכי and אסתר? How does this name capture the message of פורים as a whole? What exactly is this message that the פור represents, and if פורים is just a זכרון, how is it relevant to us today?