Most of us debate poorly. There are a number of factors like not knowing what we believe as well as we should, presenting a caricature of an opposing position, and even if we don’t err with those two, we tend to get testy! My number one resource for making improvement is The Righteous Mind: Why Good People are Divided by Politics and Religion by Jonathan Haidt. I wish every American would read and ponder this seminal book.
Here’s a good example of how to do better: