The cosmos is just because it is good; and it is good because it is the creation of God, who is the Good.
If the cosmos were not just, then righteous conduct could not be well fitted to reality, and would not therefore have proven to be adaptive. There could not then be such a category as righteousness. You can’t behave rightly if there’s no such thing as a right way to behave.
The fact that evolution has generated codes of righteous conduct – of formalized moral laws – does not then indicate that morality is nothing more than a happenstantial product of iterated memetic variation under selection pressures. On the contrary, it indicates that morality is an aspect of the cosmic landscape that is prior to biological evolution, and pervasively conditions it, *so that* iterated rounds of selection by the morally ordered cosmic landscape on memetic variations can occur in the first place, and proceed to generate in organisms moral sentiments that are more or less well-fitted to their world.
No cosmic order, then no selector, and no selection.