As far as I understand some form of consequentialism is the default ethical system on LW.
If the action has positive consequences, why should it be unethical?
I don't think (even) in consequentialism you include unforeseeable consequences into the ethical assessment of an agent. If someone plans to kill their neighbor but instead their polonium-laden coffee turned the neighbor into spider-man, they are still just as immoral, even if the act itself can be retroactively deemed good. You might even hail the agent for helping save the human race from the evil Doctor Octopus, but you certainly would not want to be their neighbor, no matter how consequentialist you are.
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