In my humble opinion, dwarves do not have the intellectual or ethical capacity to recognise that pulling a lever will result in the demise of a noble, and neither can they agree or disagree with the morality of such an action.
But they should be able to recognize this, and have an opinion on this.
If voices in your head told you to pull a lever, without knowing why or the consequences, would you?
Perhaps once, but never after you get jailed for killing a man with these actions.
Dwarves are commonly seen as pack animals, keeping together. Killing another dwarf is [...:PUNISH_CAPITAL]
If your actions link to the death of someone, you should try to not do that again.
Holding them responsible for the action is therefore flawed. Ultimately, the player has committed the act, and since dwarves can only get revenge by lowering the FPS to 1, blaming each other is useless.
But the player can't be held responsible for the actions, the player is the train of thought (or something) in the fort. The dwarf that committed the act should be punished. Even if you specified the lever to an unloved cheesemaker, dwarves should start getting edgy at the idea of both killing people, and in turn being hammered for their crimes. Self preservation would make dwarves shirk away from lever pulling duty.
Besides, how can any dwarf seek revenge on the lever-puller, when the system works by having the job choose a dwarf? All of the dwarves were accomplices because all of them would pull the lever if they were asked to.
You can specify who pulls the lever, but most people don't care, because there is no punishment. If there
was punishment, nobody would be inclined to let anyone useful pull the lever. Don't specify the lever, and Murphy's law, your legendary metalsmith has nothing to do, sees a lever, and is branded a heretic and a murderer.
Finally, I'm of the opinion that my will is law in my forts; I control them and I can delete them. If elfy dwarves choose to protest my actions, there are plenty more levers that can get pulled...
Has ruling with an iron fist
ever worked out, ever? People with that general opinion
tend to be killed. Rebellion under an iron fist is quite common.
Also a question: Why is rebellion Elfy?
Is it because they would disagree with your opinion on fort-running, and elf is a general catch-all term for bad?
It seems more human to me, elves never struck me as punk-rockers.