In defense of "agreeing to disagree"

I just saw someone on Facebook say he didn't like the phrase and thought it was used by people who could not defend their position. I'm a great fan of the phrase. I use it when I choose to be merciful, which is more often than my readers may realize. I would prefer to have brambles in my view than scorched earth. One meaning of the phrase is "you are not worth my time." But the more common