@freemo All three are authoritarian as fuck, so no.
> Yes, eliminate all people I think are evil.
It's straightforward authoritarianism, i don't hold the objective truth about who is evil.
> Yes, eliminate people the majority think are evil
Majority also do not possess objective truth, and it is unethical to impose their will on everyone, especially when it comes to mass murder.
> Yes, eliminate people who objectively cause harm
This is essentially the same as #1. Most of the time people don't separate "i subjectively believe this person is evil" and "i believe this person is objectively causing harm". Many people believe that gay people "objectively cause harm", these people aren't lying or trying to manipulate, they just genuinely think it's true.
...
If instead of just thanos' superpower, you gave me a magic oracle box that would predict with 100% accuracy who would do more damage, i might consider listening to its suggestions.
> There is no objective measure
No, see - this is why i added the note about the "magic oracle that will predict everything". There is an objective truth about who will cause more harm (for a certain belief system with defined terminal values, like reducing suffering is important, human life is important, etc.)
What i said is "humans aren't AGIs". Humans are dumb. I don't think i personally can figure out this objective truth, as well as any other person.
Does your #3 option implies that you will have an objective 100% accurate predictions about who will cause more death and suffering? Then it's worth at least thinking about.
However, using the thanos' superpower in itself would cause a lot of murders, so probably it would kill you in the first place. After all, for building the world without suffering, no murder is required in ideal case. Any death is loss, so it's better to not use weapons of mass destruction.