bigotry is the enemy of the free exchange of ideas
excluding bigots increases freedom
this may feel alien to you, because you have an invalid view of what a bigot is, and what they do
they poison conversations and harass because someone is a woman, black, gay, trans, muslim, blind, etc. they want to make the targets of their hate have as miserable an experience as possible until they leave the conversation
*that* is the enemy of the marketplace of ideas