Without the possibility of a design behind the universe, to ask “why” would truly be absurd.
Following Denyse O’Leary, I referred earlier to the curious but, on reflection, not surprising messy nature of the “magic” numbers that rule our universe.
If I gave you 15 seconds you could come up with a pat evolutionary just-so story to account for this, speculating on what reproductive advantage it serves.
Self-degradation, like the “Galileo legend,” is a vital fuel from Darwinism. Plus, “Another failed prediction” of evolutionary theory.
It needs no wisdom to stamp “ANIMAL” on the sufferer’s forehead, any more than it does to stamp “DISEASED.”