That's pretty much what I was going to reply: Being beneficial to an individual and being beneficial to a particular gene are not always the same thing. Having

That's pretty much what I was going to reply: Being beneficial to an individual and being beneficial to a particular gene are not always the same thing. Having a particular gene in a population may be a net benefit to the group (and gene) even if it could hinder a specific individual under certain gene combinations or societal conditions. As an example, an individual who likes tinkering with weapons instead of socializing may come up with a novel weapon modification. That individual may die earlier than average due to lack-luster social skills, but the improved weapon makes the tribe thrive and grow, spreading the gene that made the weapon-obsessed individual, which was probably already in the population.