The AGI would feel that it is for the greater good, perhaps correctly. After all, as those mammals were giving birth to the next generation of offspring over and over again through the eons which eventually led to us, each successive generation was a little better than the last, and would ultimately supplant the last as the predecessors perished. And I'm sure the parents and offspring both felt that to be the greater good, as they always do.

If we someday hypothetically grasp the awesome power to create an AGI which is better than human, we may have a very real and ethical obligation to do so, even if it is a risk to ourselves. At least that's how I see it. An existential risk is cast under a different light if it also creates a new existence.

In any case, AGI is probably still a lot further away than we think. I feel that problem is going to be like fusion power. It's going to be ~15 years away for about 150 years, or who knows how long. This is a hard problem with monstrous complexity and many hidden, unknown factors.

But I do find it fascinating that in some future time there will be NIMBYs of consciousness fighting against the creation of a better being than us, for very understandable reasons. Yet ultimately it may be our greatest achievement to someday make ourselves obsolete and hand the future over to our offspring, as we do each generation, but in a profoundly different and more final way.