Presumably individual aggression versus fertility is an inverted U shaped curve in which fertility rises with aggression to an inflection point and then declines. That point is probably higher than we would like for the achievement of other social goals.
It may be that at the level of civilizations the aggression versus fertility curve is different than for individuals: Memes may propagate more efficiently with more or less aggression than genes do. But social media is showing that brutality is more positively correlated with virality than we'd hope for.
If cultural values about aggression reduce fertility to below replacement they become culturally suicidal. For both aggression and pacifism the dose is the poison. Calibrating the dose is an eternal political and biological battle.
It may be that at the level of civilizations the aggression versus fertility curve is different than for individuals: Memes may propagate more efficiently with more or less aggression than genes do. But social media is showing that brutality is more positively correlated with virality than we'd hope for.
If cultural values about aggression reduce fertility to below replacement they become culturally suicidal. For both aggression and pacifism the dose is the poison. Calibrating the dose is an eternal political and biological battle.