The more accurate allegory I like is tricking yourself into believing that will have to live the life of everyone who as ever lived (like reincarnated once at a time). It still means that you have to kill hitler because you would want to protect all of your other reincarnation experiences, but you’re not necessarily going to torture them alive for fun… maybe for deterrence though.
It’s the most true to the fact that everyone has the same experiences we do, we’re just numb to them. We would act as if the first paragraph were true if we could somehow tap into the consciousness experiences of everyone else. Selfishness is just ignorance