Being irradiated by hundreds of watts of direct sunlight is fine for a short while (and causes skin cancer in the long term!), hundreds of watts of microwave radiation for the same duration is already pretty bad, and the only good thing about hundreds of watts of hard gamma radiation is that you don't have to worry about the long-term effects too much.
None of this "oops arsenic wallpaper is actually bad" "oops asbestos is actually bad" "oops lead in fuel is actually bad" "oops microplastics could actually be bad" stuff.
And we do care about walking in sunlight, it's called sunblock/suncream. People that spend their lives in a lot of sunlight are at higher risk for skin cancer, have you never seen what someone's skin looks like after a career of working outdoors?
As a Kiwi I guess I'm just more aware of the Sun; thanks to the rest of the world we have a huge ozone hole above us so our UV levels can get pretty mad around 11:00-13:00 in Summer.