I'm sorry, but this is a very naive perspective. And completely chronocentric. The "arms race" started when the first hominid learnt how to throw a rock at his fellow species. Do you really think we are simply going to "end" this arms race?

I don't mean to be snarky, but with the inevitable colonization of space, do you really expect people to just be super awesome peaceful and loving? And not have an arms race?