The part that dealt with ethics was incredibly naive. About 47 minutes in, for example, he is counseling us not to fear ET, because ET's morality will inevitably be superior to our own.
This seems pretty daft to me too. It looks like a kind of moral realism - according to which being eaten by aliens might well be "good" - since it leads to more "goodness".
Right. But moral realism is not necessarily daft. It only becomes so when you add in universalism and a stricture against self-indexicality.
http://vimeo.com/22099396
What do people think of this, from a Bayesian perspective?
It is a talk given to the Oxford Transhumanists. Their previous speaker was Eliezer Yudkowsky. Audio version and past talks here: http://groupspaces.com/oxfordtranshumanists/pages/past-talks