There are people who detest others just because they are happy. These are usually the people who either are lost or detests people who has no idea of how harsh reality is yet being happy just by ignoring it..... however..... I still don't think that it is a suitable reason to take one's own happiness. If you truly understand pain..... if you truly understand what it means to lose something..... wouldn't it give you more reasons to protect other's happiness so that they do not experience the same thing as you?