Whenever I read one person's opinion of a topic I'm unfamiliar with, I'm quickly convinced they're right. After all, the author has posed a feasible answer to the problem. And I'm left unaware there are multiple ones.
Recently, I read a book, co-authored by 5 individuals. Ch. 1 consisted of the 1st author's thesis. Ch. 2 consisted of the remaining authors rebutting his thesis. Ch. 3 consisted of the 2nd author's thesis... and so on.
By the end of the book, I was so much more intellectually edified and had so much deeper a grasp of the issue than if I had read any one of the author's opinions alone, accepted it blindly, and been on my way.
All books should be written in debate format. So should all blogs....