Arthur C. Brooks has written an interesting article for the Wall Street Journal about the politics of happiness. His work is based on poll findings that people on the extreme right and extreme left report being happier than those whose political leanings are less radical.
People at both political extremes are characterized by straight-out hating their opposite numbers and being only too willing to say so online. Those of us who are less extreme in our views are also more moderate in our statements, and probably in our feelings too.
Brooks makes the good point that while the political extremes may be happier, they make those of us around them less happy with "their intolerance and antisocial ways."
I expect some people can enjoy hating the way they enjoy a number of other intense emotions.