Any Good forum for discussion of difficult topics you recommend that has a good UI.

Go on "my posts."

It's all there, I've never had a problem with it.

You could try starting your own topic. The "My Posts" tab only links to threads that you have posted on, so if someone responds to a thread you last answered two years ago it will show up at the top of your "My Posts" feed. But it's pretty easy to check in on your own topic. I noticed that your "Is the world changing for the better or worse?" topic has gotten bogged down in a "meta" discussion about discussion but it might not be too late to start a pertinent conversation.