Let the words “natural” and “unnatural” act as warning bells, so that whenever you hear the words used you know that a bad argument is soon following.
The use of “natural” and “unnatural” as an argument is called Appeal to Nature. The blog The Logical Place explains it well. Whenever I try to explain this, I struggle to come up with good examples. Could you please help me with examples where something natural is bad, or something unnatural is good?