An alternative takeaway from these posts is that we should segment our personality. In the same way I can only have emotionally honest conversations with close associates, maybe I can only have intellectually honest conversations with people I can trust. There's no sense trying to cooperate if the other side always defects.
I don't have the luxury of living in an ivory tower and the opponents in my particular quest will always push the bounds of reasonability.
In the spirit of contrarianism, I'd like to argue against The Bottom Line.
As I understand the post, its idea is that a rationalist should never "start with a bottom line and then fill out the arguments".
It sounds neat, but I think it is not psychologically feasible. I find that whenever I actually argue, I always have the conclusion already written. Without it, it is impossible to have any direction, and an argument without any direction does not go anywhere.
What actually happens is:
It is at the point 3 that the biases really struck. Motivated Stopping makes me stop checking too early, and Motivated Continuation makes me look for better arguments when defective ones are found for the conclusion I seek, but not for alternatives, resulting in Straw Men.