Th aggregation of morals in the light of infinitarianism

You do a' good' or a 'bad' thing in a moral sense. In a finite world the 'good' will impact as will the 'bad'. It will aggregate out.

But if the world, the universe (s) are infinite, as most cosmologists
now believe, and all good and all bad has already been commited over and over again, what then?  So in this light of infinitarianism, bearing in mind that one cannot add to an infinity how might we conduct ourselves. Eh?

 I don't know about you - but I don't want to think of it, better men than I
have gone mad contemplating infinity.