"Your proposition is that laws should be enacted based on the "harm principle". Conservatives generally reject this proposition because it draws too small a circle and fails to outlaw many acts that are obviously immoral to the majority of human beings, Christian or non-Christian, religious or secular.
A better proposition is that laws should be enacted based on humanity's conscience. The idea that something is wrong because the conscience tells us so is sometimes rejected by liberals. Some liberals even reject the existence of a conscience. But that simply goes to show how disconnected most liberals are from the general human being.
My grandfather was not a Christian. In fact, he'd probably never heard of Jesus or the Bible throughout his life. And he could hardly be described as a religious man in any sense of the word or in association with any religious tradition. However, my grandfather's conscience told him that incest was wrong. And people inside his society as well as outside his society in other parts of the world throughout history also had their consciences tell them that incest was wrong. This has very little to do with the "harm principle" because the advent contraceptives did not change the voice of the conscience (ie. the harm was done away with but not the immorality).
In create their own ideas about what laws and morals should be, liberals have a tendency of going against the very nature of humankind."
I am rendered almost speechless.
I don't know what world he lives in, but it definitely isn't ours.