Hit the road, Jack, and don't you come back no more, no more, no more! Hit the road, Jack. I like the song! Now, seriously:
Immorality is a choice. Fine. But immorality has a way to come out as BAD, AND BECOMES SUBJECT TO CRITICISM. Whoever made a bad choice hates that. So, the best strategy to "excuse" it, "justify" it, and pretend it is GOOD, is to eliminate ANYTHING that opposes it: God, The Ten Commandments, the Church, Religion, the conservatives, etc.
We do not stop anyone from making a choice, even if it is BAD. But, if we respect the right of the sinner, we cannot accept the sin, much less swallow the idea that WE HAVE TO PAY FOR IT!