I think his claim was that the utilitarian analysis is flawed because if you accept it, it may force you to justify Hitler, which is morally unacceptable, so th

I think his claim was that the utilitarian analysis is flawed because if you accept it, it may force you to justify Hitler, which is morally unacceptable, so the utilitarian premise that forces you in that direction can't be accepted, and therefore can't be used to justify nuclear weapons either.