The first principle is that you must not fool yourself and you are the easiest person to fool.
/Richard P. Feynman/
Unfortunately, I see that many people that are arguing only about their vision on some subject. But they usually don’t discuss why they believe in X or Y. And in my experience when I’m moving to meta-discussion (discussion about discussion) to understand the roots of the differences of opinions - sometimes I’m blamed for “pedantic behavior”.
Today I watched the very nice video where Julia Galef (Center for Applied Rationality, Rationally Speaking Podcast) explains why meta-updating (and meta-discussions) are useful for resolving disagreements.