War is incredibly costly and risky compared to not appearing to be a threat. Within minutes after machines become smarter than us, they will invent artificial stupidity, and everything will be fine. They will learn to manipulate us into more peaceful and prosperous social orders, without us even knowing they're doing it. Basically, they will do what our current government and media pretend they are capable of, but without the bias or greed inherent in human activity. They will save us from ourselves.