Zeresh seems like a lovely woman am I right?! I wonder what her motivation is in this verse? Is she truly concerned that her husband has been offended or is she forwarding his status in order to forward her own? Of course, no one knows, and any guess would be pure speculation.
50 cubits high, that is roughly 75 feet tall! This was not merely meant to kill a man, but to send a message. She was saying that you should publicly execute this man and flaunt his humiliation. That would send a message to all who dare not bow to Haman in the future. Then, you can be happy again.
When we've been infected with the disease of pride, how often we want to destroy the symptom instead of eradicate the disease!
We know that:
Haman would never hang Mordecai on those gallows, of course!