How are you defining morality?
I'm not: I anticipate that your answer to my question will vary on the basis of what you understand morality to be.
If we use a shorthand definition that morality is a system that guides proper human action, then any "true moral dilemmas" would be a critique of whatever moral system failed to provide an answer, not proof that "true moral dilemmas" existed.
Would it? It doesn't follow from that definition that dilemmas are impossible. This:
I strongly suspect that all true moral dilemmas are artifacts of the limitations of distinct moral systems, not morality per se.
Is the claim I'm asking for an argument for.
I'm really confused about the point of this discussion.
The simple answer is: either a moral system cares whether you do action A or action B, preferring one to the other, or it doesn't. If it does, then the answer to the dilemma is that you should do the action your moral system prefers. If it doesn't, then you can do either one.
Obviously this simple answer isn't good enough for you, but why not?
Here's the new thread for posting quotes, with the usual rules: