edit: I’m genuinely curious if it’s possible to allow sunlight while blocking harmful radiation, our atmosphere does it, can a thick window do the job?
Not one that’s likely to be solved by spreading to the moon. Personally I have much the same attitude about the eradication of the human race as I do about dying: it’s going to happen eventually, best to make out time here as good as possible rather than trying to extend it indefinitely at all costs. And giving up the earth seems like a huge cost to me.