Nuclear actually ended up keeping the world mostly at peace. Unfortunately, AGI is not something you can use to create stability via MAD doctrine - it's much more like bioweapons, in that it starts as a weapon of mass annoyance, and developing it delivers spin-off tech that bolsters your economy... until you cross a threshold where a random mistake in handling it plain ends the world, just like that.
Nuclear actually ended up keeping the world mostly at peace. Unfortunately, AGI is not something you can use to create stability via MAD doctrine - it's much more like bioweapons, in that it starts as a weapon of mass annoyance, and developing it delivers spin-off tech that bolsters your economy... until you cross a threshold where a random mistake in handling it plain ends the world, just like that.