What was the overall impact? Did the debate never happening end up deteriorating Mosley’s approval?

Disclaimer: IMO free market of ideas does not favor logic, so debate is completely worthless for preaching logic. I advocate deplatforming deliberate bad actors, while still showing some patience while explaining things to those who are still acting in good faith. Also, if you aren’t usually very good at explaining things, just steer them towards more eloquent orators - it’s better than killing their willingness to listen.