There can be room to discuss the merits of the evidence used to support an argument, and alternate explanations for cause and effect especially as systems under discussion increase in complexity, but it would be nice once in a while to see people say, "You know, that is an interesting point, and I need to give it some thought. I'll get back to you." But instead, it's usually, "You disagree with me, so you must hate puppies and kittens and happiness!"