"Pebblesorters value creating heaps of pebbles that have a prime number of stones in them, and are horrified by heaps of pebbles with the "wrong" number of stones. We humans can understand the rule behind their moral intuitions (better than they can, even, since they seemingly haven't realized the rule they're following), but even though we understand what's "right and wrong" from their perspective we still find sorting pebbles a pointless waste of time.
Many humans think that any advanced enough artificial intelligence will be moral and good, because it'll be smart enough to understand right from wrong. And an advanced enough AI will understand human morality - maybe better than we do, even, it could perhaps deduce and codify the rules that humanity has been stumbling towards over our millennia of moral progress. But, despite understanding, it won't care any more than understanding pebblesorter morality makes us want to sort pebbles."
If you're going to use analogies, use analogies.
Sometimes you have to drop the cleverness and just talk to people.
https://youtube.com/watch?v=cLXQnnVWJGo