[mikemotherwell]

Instead, he recommends taking a supplement shown to be next to useless...

This is a tough argument, because AFAICT this is the full argument:

1. We can do positive things for what the sun hurts, e.g. we can treat high blood pressure.

2. We can't stop melanoma.

3. Therefore, avoid the sun, and take medications to treat the resulting complications.

That's an argument that takes one risk (Melanoma) and contrasts it with other risks minus the efficacy of their treatments. I have no idea how ANYONE has worked out that equation, as no working is shown.

Personally, I really like the sun, and the lifestyle that comes with it. Doesn't seem like a small increase in Melanoma risk is worth giving all that up, especially when the cost is taking more medication for years as a result.