Well, that was what in fact happened. But what could have happened was perhaps a nuclear war leading to "significant curtailment of humankind's potential".
cousin_it's point was that perhaps we should not even begin the arms race.
Consider the Terminator scenario where they send the terminator back in time to fix things, but this sending back of the terminator is precisely what provided the past with the technology that will eventually lead to the cataclysm in the first place.
EDIT: included Terminator scenario
According to Eliezer, making AI safe requires solving two problems:
1) Formalize a utility function whose fulfillment would constitute "good" to us. CEV is intended as a step toward that.
2) Invent a way to code an AI so that it's mathematically guaranteed not to change its goals after many cycles of self-improvement, negotiations etc. TDT is intended as a step toward that.
It is obvious to me that (2) must be solved, but I'm not sure about (1). The problem in (1) is that we're asked to formalize a whole lot of things that don't look like they should be necessary. If the AI is tasked with building a faster and more efficient airplane, does it really need to understand that humans don't like to be bored?
To put the question sharply, which of the following looks easier to formalize:
a) Please output a proof of the Riemann hypothesis, and please don't get out of your box along the way.
b) Please do whatever the CEV of humanity wants.
Note that I'm not asking if (a) is easy in absolute terms, only if it's easier than (b). If you disagree that (a) looks easier than (b), why?