I think we can agree on what I said in the grandparent: the pope would be the biggest one-person schelling point, and it's not a good choice for initial dynamic.

Actually it might not be that bad. The theology of the body thing they have going might however mess up transhumanist aspirations I have and that would suck. But otherwise I expect a world mostly free of disease and poverty with much longer (but perhaps finite) lifespans where Western traditional values are given a boost.

That's pretty close to utopia when considering most other outcomes. Certainly it would be a more pleasant place to live than Robin Hansons em world.

the pope would be the biggest one-person schelling point

Yes, exactly.

and it's not a good choice for initial dynamic

And therefore, choosing a Schelling point for morality as base of CEV is probably not as good idea as it may seem. Unless one believes that ten-person or hundred-person Schelling points for morality would bring dramatically different results.

(And this is basically what I was trying to express in the comment that got so many negative points. Pope could be a Schelling point, Dalai Lama could be a Schelling point... Eliezer Yudkowsky would be a Schelling point inside LW community, but not outside.)

The result of your gedankenexperiment is fully Catholic world and Crusade decared against the alien scum.

It's extrapolated volition that matters, not current volition. If the Pope had the same beliefs about facts that we do, his most important difference with most of us might well be something like old age.

In the thought experiment I would also likely vote pope since he seems by far the most likely candidate to win and also would not be a moral leader so bad that I wouldn't want to live in that world.

The result of your gedankenexperiment is fully Catholic world

Not actually true, I'm sure lots of educated people would make the guess that the pope is likely to win the election and vote the same way. I'm also pretty sure many non-Catholic Christians might decide he is the best pick likely to win.

I'm also pretty sure almost instantly after the calamity lots of humans would start worshipping the aliens.

and Crusade decared against the alien scum.

Unlikely to happen because of how suicidal that would be and that most Popes being intelligent people would realize this and would I think encourage the "turn the other cheek" memes to deal with the grief and outrage. However a few billion deaths might animate mankind aware of the cost in powerful and difficult to control ways.

How would malevolent aliens behave?

They would kill us, or worse, without giving us any chance.

Just like a super-human AI without design for friendliness will probably kill us, or worse. An AI designed for friendliness will need some choices from us -- for example whether to use CEV of humankind, and how to approximate it if we can't measure literally every person on the planet -- and a bad choice could have horrible consequences.