They were banned because of what they chose to write, it wasn't just because of a political discussion.
https://news.ycombinator.com/threads?id=dang
https://news.ycombinator.com/threads?id=sctb
I guess it is also necessary to turn on showdead in the settings.
I don't agree. I think it's worth reading and trying to understand the perspectives of the participants. I wouldn't guess that any of them feel embarrassed by their comments. Instead, I get the feeling that everyone feels like they did what they must and the outcome matched their expectations based on the world they each perceive. I think it's instructive to review the episode and consider whether a different approach might have been able to reach a better result.