The logic may work via negation or inversion. Eg there is individual disincentive for both women and men to engage in high-risk behavior. But societies still needed a class of people to go out and hunt game, defend society from lions or opposing armies, or other higher-risk ventures, despite the individual disincentive to do so.
Women are not expendable and thus society did not incentivize them to do these high-risk things. But men are, so societies created various social incentives to facilitate high-risk endeavors - honor, social esteem, medals, hierarchical rank, wealth, fame, etc. Many died doing so, but the ones that succeeded and survived reaped these various rewards and got to mate, producing heirs with similar risk-taking characteristics and capabilities from both nature and nurture.
