How many people have you heard dying of skin cancer vs other cancers around you? High Vitamin D levels have shown over and over again to decrease the risk of serious cancers (the littérature is abundant).

Melanoma causes 1.5 % of total cancers related deaths according to CDC so you are much more likely to die from all the other types of cancer. https://gis.cdc.gov/Cancer/USCS/#/Trends/