I see a lot of people in the comments to this post talking about divorcing the "damage report" aspect of pain from the "unpleasant experience" aspect. This won't work -- at least, not in naive form. Emotions are what motivate people to do things. If you take away the negative emotional impact of pain without some kind of situational fine-tuning, you might as well remove pain entirely. Those people with pain asymbolia that I mentioned previously are indifferent to the threat of harm.