The answer is: Mordecai would not bow down to him

Esther 3:5-6

Haman’s intense animosity towards Mordecai serves as a conduit to uncover deeper themes in the Book of Esther, particularly around pride and revenge. When Mordecai refused to bow to him, it struck a nerve in Haman. His reaction wasn't just a typical grudge; he took it to unprecedented levels, seeking to annihilate an entire people merely because one man disobeyed him.

This sparks an interesting thought: the disproportionate response of power in the face of disdain. Haman’s arrogance portrayed a higher standard of respect for himself than for human life, reflecting a cautionary tale about unchecked ambition that resonates beyond ancient Persia.

Interestingly, Haman’s reverence for royal decree led him into a trap of his own making. Or, you could say, he lived quite literally by the rotten fruit of revenge and pride. In post-biblical suggesting superstitions, Haman even gives us the name for “gallows”, tied to his own downfall. Quite the twist of fate!

The echo of Haman’s penchant for villainy can be seen in recurrent themes in stories where the hatred for a single individual—be it out of jealousy, pride, or faith—leads to widespread violence and persecution. It’s a vital teaching about discernment: how our lives and faith can twist into tragic ones when dwelling on the contempt of others. Esther's triumph introduces resilience against turbulence, bravely standing up for her people by challenging not just Haman, but the very structures of oppression. This is ultimately a story of courage in diversity and strength in unity.