Even if one accepts claims about anthropogenic global warming happening and causing wildfires and hurricanes as being totally true, the justification for not simply banning all fossil fuels is the good that is done with their use.

So the analogy should be a question of how much good is done with the undead created.

For creating undead to be inherently evil, then, it must be true that so much harm is caused by the animation of even one skeleton that no amount of lives saved, no amount of happiness generated, no amount of wonderful, good, wholesome, uplifting virtuous results of the use that skeleton is put to could ever be worth it. The sorrow, pain, devastation, loss, and ruin of creating that one skeleton must always outweigh any boon it might have granted.

Remember, to use the “car” analogy, you have to assert that every time you start up your car, it is creating so much pollution that it is a morally-indefensible act. No matter what good you plan to do while it’s running. This is required because we’re using this to justify why animate dead is always evil.

This does start us down the tracks to a trolley problem, though.

Objective morality, also, for the record isn’t inherently arbitrary. Newton’s laws are objective, but are not arbitrary; they’re derived from the underlying truths of how matter and energy behave.

Expecting objective morality to have fundamental foundation beyond “because something said so” is not demanding subjective morality. Subjective morality is morality that can say the same exact act is good to one observer and evil to another, based on their moral codes. And if morality is subjective, neither moral code is automatically more correct than the other.

Objective morality would make one more correct than the other in the same way that objective reality makes the atomic model of matter more correct than the elemental model of matter. Not because some arbitrary text says “yeah, that’s the model to use,” but because that model more closely resembles reality.

Great Wheel cosmology establishing objective morality means that there are fundamental forces that drive or are driven by moral choices. And the outer planes operate on rules that reflect these moralities (and ethics).

Now, the writers of the setting could claim that eating with your left hand is an evil act because it empowers the lower planes, but that becomes arbitrary and unsatisfying. Which is my problem with animate dead being evil because of “evil pollution.” You may as well be saying “it empowers the Abyss.” Why? Because!