> If you drive them, and their ideas, deeper into the underground there will be no one there to oppose any of their ideas, it will be yet another echo-chamber driven by a victim complex.

Exactly. This is the same argument I pose with my neoliberal friend about Ann Coulter, Alex Jones, David Duke, etc.

"Think of the children!", I cry. If society refuses to acknowledge ideas that they find offensive the ideas don't go away, ignorance just goes unanswered.

Following this line of thinking, maybe it would be more useful for YouTube to recommend more moderate sermons/lectures to people who are looking for extremist videos.

Google could go a step further and insert ads for mental health when people view content like this. The public could also take this upon itself, especially in countries like the UK and Canada, purchasing ads for national mental health services targeting these users.