I can't find the thread where the baboons were mentioned. The troop with aggressive males who infected each other with fatal STDs, changing the behaviour of the troop to much more peaceable, a change which lasted at least 7 years. The poster thus attributed the change to culture rather than anything else.
I wanted to post on that but I can't find it.
Because that does not hold at all. The aggressive males had removed themselves from the gene pool, leaving it calm and untroubled for the new culture to be established. It was both nature and nurture.
How that can be applied to Hom sap is a problem.