This is a linkpost for https://atheistkit.wordpress.com/ethics/
No, no, no...
Every possible creature, and every process of physics SHOULD do XYZ. But practically nothing is moved by that fact.
This sentence means: It is highly valued in the morality equation for XYZ to be the state of affairs, independently of who/what causes it to be so.
Likewise, everything Spiritould do ABC, but only Elves are moved by that fact.
These are objective equations which apply to everything. To say should, spiritould, clipperould, etc., is just to say about different things that they are valued by this equation or that one. It's an objective truth that they are valued by this equation or that one.
It's just that humans are not moved by almost any of the possible equations. They ARE moved by the morality equation.
Humans and Elves should AND spiritould do whatever. They are both equally obligated and ochristmasated. But one species finds one of those facts moving and not the other, and the other finds the other moving and not the one.
Perhaps now it is clear?
It is not a clear expression of something that can be seen to work
Version 1.
I am obligated to both do and not do any number of acts by any number of shouldness-equations
If that is the case, anything resembling objectivism is out of the window. If I am obligate to do X, and I do X, then my action is right. If I am obligated not do to X, and I do X, my action is wrong. if I am both obligated and not obligated to do X, then my action is somehow both right and wrong..that is, it has no definite moral status.
But that's not quite what you were saying.
Version 2...