It seems that the only "morals" that should not be legislated are the sexual ones.
I'm not sure that anyone has stated that. I was merely using one or two examples from the top of my head.
What sort of immoral behavior, if any ,do you think should be legislated?
What some find immoral, I might not and vice versa. Which is why I am always a tad concerned when the topic of legislating morality comes up.