I listened to about 6 hours of Marc Andreessen on this topic this weekend and he just smashes all the doomer arguments.
Even in the context of nukes he made a great point that the invention of nukes most likely caused WW3 to not happen. An all out, devastating war between the US and Soviets over Europe that was only averted and transformed to the cold war because of MAD. I have been thinking since then how nukes probably caused my father to not fight in WW3. Who knows how many of us reading this would never have existed if nukes hadn't been invented. You can't make the argument 'the Manhattan project, we blow the planet up, the end".
He also makes the point that you can't be worried about a super intelligence that is super intelligent in every way besides being so dumb that it turns everyone into paper clips. You can't have it both ways.