Dak
mentat
I'd argue that the institution of marriage has much more value socially-speaking as an instrument of stable households and preventing children from going native. Men commit the vast majority of violence no matter the social status quo, and often a huge chunk of that violence takes form in spousal abuse. Strong social pressures of monogamy and marriage don't prevent violence against women, they just regulate it and, through much of history, legalize it, treating it as a necessary evil so that women continue their motherly duties. Violence and homicide rates fluctuate significantly through history and I've never seen an argument (let alone a compelling one) that "violent attacks are what happens when men do not have partners" or that "monogamy emerges [because violent men are] angry". The fact that violence has been on a gradual 200+ year decline with a few bumps and dips here and there would seem to indicate that free love doesn't have much to do with it. Is it the reason one incel goes on a killing spree every five years or so? Sure, but that doesn't make it a social problem, let alone one which needs to be addressed with ancient solutions to a problem already solved. It's a problem of a tiny minority of losers and the solution is probably better policing of places like /r9k/.
You might find this an interesting read by an anthropology student at UC Davis.
http://quillette.com/2018/02/24/behavioral-ecology-male-violence/
However, when looking at the most common causes of lethal conflict across cultures, we can see a clear relationship between a male’s fitness interests and killings. Homicide often occurs in the context of revenge, fights over status, and sexual jealousy.25 Competition for territory and resources also plays a strong role, particularly in the context of coalitionary killings, such as in gang violence and warfare. Cross-culturally, revenge often occurs in the context of seeking vengeance for a relative that was killed, which may act to deter future attacks on the killer’s relatives, and thus increase his inclusive fitness. Revenge is also often related to fights over status against rival males. Furthermore, having high-status and being able to control desired territory and resources can often increase a male’s reproductive success, through mechanisms beyond just force, such as female choice, or by being a preferred partner in marriages arranged by a potential wife’s parents.26
As for homicide due to sexual jealousy, this often occurs in the context of the (real or perceived) threat of infidelity.27 This might be a male killing his wife’s lover, or his wife, out of a belief that she is cheating, or fears that she will leave him.
As these patterns indicate, male violence in humans often occurs in contexts where a man’s reproductive success is threatened, or where he may derive greater reproductive success from engaging in violence. Due to our evolutionary history, even in modern contexts where specific violent behaviors may not be fitness maximizing, such as in an armed robbery or gang violence, we can consider these behaviors to be, in part, a byproduct of a greater propensity among males to aggressively pursue status and gain resources in ways that would have increased their reproductive success in the past.28