However, the parent says this is NOT an epistemological principle, that one should prefer to get the most benefit when choosing between equally-punished crimes.

So is it saying that epistemology should not allow for equal punishments for unequal crimes? That seems less like epistemology and more like ethics.

Should our epistemology simply not waste time judging which untrue things are more false than others because we shouldn't be believing false things anyway?

It would be great if Jason would give us more context about this one, since the meaning doesn't seem clear without it.