Question

Is someone who does not oppose same-sex marriage because it does not harm anyone, but does oppose a marriage between a father and his adult daughter even if they would be forbidden to have children with birth defects, or who opposes necrophilia, zoophilia, and cannibalism because “it isn’t natural”—society determines what is natural and what is not, and any deviation from the path society has set is unacceptable. Today the majority accept same-sex marriage except for religious people, whereas incest, necrophilia, zoophilia, and cannibalism are not accepted by the majority—is such an argument a valid argument? Isn’t that hypocrisy? 
Is there any other example of values we are committed to that are not connected to morality, and sometimes even contradict it, aside from a religious value? The point is to bring this idea closer to the minds of people who are not religious and prove to them that they too do things that run against morality because of other values.