That of course is a matter of perspective and how history decides to write things up. From a certain point of view (such as being underneath the bombs) we have spent the last couple of decades 'bombing people out of existence'. Certainly from the perspective of a future peaceful, united planet, it is a fair comment too make about turn of the 21st century Earth.Then next minute you have Spock's comment in 'Space Seed': "Your world was on the verge of a new dark age...With whole populations being bombed out of existence."
Always a strong possibility, as his comments about women's hysteria in Wolf in the Fold will attest.Another consideration is that Spock wasn't alway correct in his pronouncements.