It would seem to me that manners would correlate positively with survival. Manners have many sources, among which are a mutual sense of respect and an awareness of our interconnectedness. People who lack that respect will isolate themselves from others on whom they depend for the necessities of life.

There may well be exceptions to this in the short term, but as far as long-term survival goes, people who do not respect the need to work with others in a positive way will bet a serious disadvantage.