Gay Marriage

There is a huge anti gay marriage campaign in certain states of America. What i don't understands as why does it matter. Surely everyone has the right to be unhappy? Why does it matter whether we live in a world with same sex marriage. It seems highly ironic to me that the backbone against gay marriage is the Mormons. A group of people who cannot live in world where gay marriage is because it's unfaithful and against god. I find it most amusing that the group on the moral high ground about marriage are practise's of polygamy. I find this highly ironic, and hypocritical that they preach about the sanctity of marriage, when the should actually be preaching about the sanctity of marriages. Perhaps an attitude of freedom and self tolerance would do them a big favour.