The stated goals of people trying to create AGI directly challenge human hegemony. It doesn’t matter if the incredibly powerful machine you are making is probably not going to do terrible damage to humanity. We have some reason to believe it could and no way to prove that it can’t.

It can’t be ethical to shrug and pursue a technology that has such potential downsides. Meanwhile, what exactly is the upside? Curing cancer or something? That can be done without AGI.

AGI is not a solution to any problem. It only creates problems.

AGI will lead to violence on a massive scale, or slavery on a massive scale. It will certainly not lead to a golden age of global harmony and happiness.