“One reason that goes overlooked is that most human beings are not utilitarians” I think this point is just straightforwardly wrong. Even from a purely selfish perspective, it’s reasonable to want to stop AI.
The main reason humanity is not going to stop seems mainly like coordination problems, or something close to learned helplessness in these kind of competitive dynamics.
Basically, I think whether or not one thinks whether alignment is hard or not is much more of the crux than whether or not they’re utilitarian.
Pesonally, I don’t find Pope & Belrose very convincing, although I do commend them for the reasonable effort—but if I did believe that AI is likely to go well, I’d probably also be all for it. I just don’t see how this is related to utilitarianism (maybe for all but a very small subset of people in EA).