Yep. Liberalism is actually an advantageous strategy, from Darwin’s perspective, if actions don’t have consequences.
Sex, food, etc are all good to do, if there is no consequences to doing it freely.
It is only when resources tighten up, that the guy who mates with just any girl will see his numerous offspring killed off by the guy who selects a mate carefully, and monopolizes her with monogamy, to produce a fitter kid.
Likewise with fighting. The guy who avoids fights does well, if he can get food elsewhere. But once the only people who eat are the ones who fight, you see that culled back too.
It's more like, the guy who fights when fighting is not needed (like inner-city types who fight over being "disrespected") tends to have a short life, while the guy who avoids fights (but makes sure he is trained and prepared to win when fighting is unavoidable) will live a longer life.