Some people ought to have pain inflicted on them until their utility functions become sensible in the face of the threat of more pain from the same source for the same reason. This need not take the form of limitless pain: the marginal utility curve could easily fall off really fast. Not having to deal with such people will make lots of people very happy, and them in the long run happy as well. See: sociopaths and ostensibly this guy.
You might want to distinguish
Plenty of people seem glad to hear about other people suffering regardless of whether it has any plausible chances of causing behavior change. Just look at any countries that hate each other (Japan vs. pretty much the rest of East Asia), political opponents (...
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.