I don’t think I’d characterize calling one’s interlocutor crazy as “evil” so much as “mean”. I wouldn’t expect my theist friends to want to talk to me—about anything, really, much less religion—if I started out presuming them insane because they disagree with me! For the same reason, I don’t blame the theists I know from steering clear of this site. It’s a hostile environment for them, and they have no reason to enter any hostile environment, including this one. Similarly, I have precious little interest in having nonessential exchanges with or near people who have announced their intention to be mean to me. Calling it a “self-defense mechanism” looks like you think I need some reason to refrain from having conversations with or around you and those who agree with you, apart from predicting that they’ll be unfun.
I don’t think I’d characterize calling one’s interlocutor crazy as “evil” so much as “mean”. I wouldn’t expect my theist friends to want to talk to me—about anything, really, much less religion—if I started out presuming them insane because they disagree with me! For the same reason, I don’t blame the theists I know from steering clear of this site. It’s a hostile environment for them, and they have no reason to enter any hostile environment, including this one. Similarly, I have precious little interest in having nonessential exchanges with or near people who have announced their intention to be mean to me. Calling it a “self-defense mechanism” looks like you think I need some reason to refrain from having conversations with or around you and those who agree with you, apart from predicting that they’ll be unfun.
Indeed, categorizing one’s enemies as “insane” seems like a bad epistemic move—a bit closer to deciding they’re evil mutants.