Peace through complaining
In 1974, in response to a rash of prison riots, the Federal Bureau of Prisons initiated a grievance system that remains in place today. Prisoners have 20 days to file a complaint from the date of an incident, and prison officials have 20 days to respond. Although this system might seem like window dressing, a criminologist with the US Marshals Service finds otherwise. According to his analysis, late responses — but not judgments on the complaints themselves — are associated with more inmate violence. In other words, inmates seem to be satisfied when their grievances are heard, regardless of outcome, and angered only by a lack of response.
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Re. "When boys get more competitive" Culture can , and often will, reinforce and amplify biologically inherent tendencies. Or, it can deemphasize and suppress such tendencies. And any training needs to build on some biologically available trait.