"And this is not even the worst that can happen. I have withdrawn (let them expire) offers from people that after receiving my first offer tried to strongarm ridiculous bonuses. The reason I have withdrawn the offer is that it made me clear that the person does not understand their worth to us"

I thought negotiations are iterative. Start from an anchor value, then the other party suggests a higher number with reasoning why this would be a fairer value, and continue until an agreement or batna is reached.

If the response was "screw you, I want 1 million" I would understand you aggrievances but typically resenting employees attempts at negotiation gives out the impression that you want only complacent underdogs as employees.