> Yes, but OP said that in response to a comment attributing melanoma to sun exposure, in a conversation where nobody had brought up SCC or BCC.

In a thread about a trial for a melanoma drug, which has nothing to do with the discussion of sunscreen. Sunscreen was brought up because it is a culture-war topic, the fact that melanomas are not as associated with sun exposure was brought up as the standard opposite-side reply to a culture-war topic.

Clearly your unrelated accusation was brought up to silence the other side and accuse them of dishonesty. Your follow-up is to accuse them of some conversational violation (mentioning something that wasn't brought up) which doesn't exist.

It's fine to see debate, but this is not debate. At most, consistent daily sunscreen use is associated with a 30-50% reduction in melanoma, and some of the ingredients in US sunscreens are themselves associated with cancer.

What would be helpful is a link to a study showing a general reduction in melanomas during a general increase in the use of sunscreen. I'd be able to point that out to friends who questioned me about the efficacy of using it.

edit: that one sentence reply is already trying to snowball into a pile on. Now to mention this fact has become "bizarre." Can't wait until it becomes "unhinged."