One major problem I have with a lot of arguments is that at least one premise relies on intuition to be justified. The problem is that intuition is terribly unreliable and therefore cannot be used to justify a premise. Arguments that rely on intuition seem common in normative ethics from my what I have seem (The utility monster is one such example). I decided to make a thought experiment to tell if the argument relies on intuition that goes like this:
You are alien which is born with the intuition that utilitarianism and is self-evident
You discover a planet and decide to go visit it to find people living on it. you ask a person about utilitarianism and the person think it is false and use the utility monster argument to back up that assertion. Would you think this argument is sound or even makes only sense or a actual problem with the position you think is self-evident?
Utilitarianism can be changed to whatever the position be attacked is and the utility monster into the argument against said...
It's hard to see how any thought experiment could be good for filtering out all intuition-based arguments, for the simple reason that one's reaction to any thought experiment is itself a matter of one's intuitions. In your own thought experiment, I'm supposed to imagine how I'd react to the utility-monster objection if two non-actual conditions held: (1) I'm an alien, and (2) I'm born with the intuition that utilitarianism is self-evident. To be honest, I have no idea how I'd react under those conditions, but the only thing I can consult to answer the question would be my intuitions about the imagined case. Any (finitely long) argument, including any sound argument, will rely on intuitions in the sense that it will contain premises that the argument simply asserts and doesn't defend. That being said, if one's argument depends on controversial premises, then one ought to improve the argument by finding less controversial premises that imply one's conclusion.