There are two kinds of communities.

In a monogamous society, the leader gets the wife he wants, and he ensures the collaboration of other men by helping to ensure that they too can have wives and families.  Typically family has its own territory, in which the man of the house is in charge.  Some men are richer, some are poorer, but all have an independent means of livelihood (eg the land the they live on) and they all have a common interest in the system, in each little family keeping order.

In a anarchistic, chaotic, or polygamist society, the leader attempts to have control over as many women as possible.  His goal is not the collaboration of the other men, but their subjugation.  Many of them will end up irreconcilably opposed to the system, some will end up as outlaws.  The hearth and home is not respected.  The small independent incomes become mortgaged to usurers.  A poor man cannot easily have a dignified family life, because he is either forced into crime or dispossessed.

Now it's true that there has never been a large society that is purely one or purely the other.

However, it's quite clear that there is a war going on against the old system of yeomanry.  Just as there were the enclosures, the poor laws, etc.  The lower classes see marriage breaking down so that lawless men in those class are the ones who have the women.  Feminism is part of this, because in the older system, women had a lot of responsibility (as wives and mothers that's inevitable) that today they don't want.

It is a war, and people have to pick sides.  You either support monogamy despite the difficulties of the economic system, or you decide, as the British upper classes did a long time ago, to wage social war against the lower classes. (even starving the Irish, and blaming it on their lack of enterprise)

When society was rural and without welfare, the yeomanry model was the default, and communities in small towns and suburbs resembled that model to a great extent.  Particularly in the USA.  That's how it was just three or four generations ago.

Now rural small town society has declined steadily into virtual insignificance and the old style of community that was based on rural life is being crushed.

Today the polygamist mormons (who are largely of English descent) are a great example of what is going on in society in general in a much more disguised way.

The leaders of the cult often rely on welfare to literally support polygamy, just as a de facto polygamy of "serial monagamy" (ie promiscuity) of young women is supported by the welfare state and the family laws that ensure women are cared for even when men are driven from their homes and unable to get family supporting employment.

The unwanted young men in polygamist communities are driven away from the community.

And in the same way, unwanted surplus males are being prevented from gaining family supporting employment now throughout the western world, more than ever before. (or in nightmarish situations, divorced and forced to work to send money to the adulterous wife with the threat of imprisonment hanging over his head)

Those who "benefit" from this are those who enjoy the "benefits" of so many unattached young women without jealous husbands to worry about.