You should report them to the police. I don't care who you are, that's definitely messed up, red flag behavior, and really ought to be illegal. If child p*** is illegal to possess, so should those videos. Anyone who intentionally watches those videos is, morally speaking, an accomplice in the murder to some degree. They give the murderer more views, encouraging them to do it more.
But if there is no unhappiness, that must mean all our desires are satisfied to our... well, satisfaction. If all we know is satisfaction, does it really make us happier to suddenly have our desires really, super, extra satisfied instead of just satisfied? If you've never felt hunger before, is it happy to learn that you're getting an extra big meal today?