Usually, it is for the mutual benefit of the group. However, when young men form groups, without proper supervision and leadership, they become corrupted. These groups are not so much for mutual benefit, as much as they are for acceptance. We know them as "Gangs". Without proper grounding in what it means to be a man, how to live as a contributing part of society and how to accept the burdens and share the joys of being a man, destructiveness follows. Unfortunately, one man alone is not sufficient to teach even a small group of boys about what it means to be a man. It takes a diversity of personalities, abilities, and styles to teach even one boy or young man about manhood.
Its not easy to be a man. There are a lot of burdens put on men, that neither men nor women understand. Although a lot of men's groups are put down as "just going out in the woods and beating drums", there is a lot of hard mental work going on that can lead to a better life for all. Some people know and understand this. Unfortunately, not enough. Through men's groups like this one, with open and frank discussion, maybe more people-both women and men-will learn more about themselves.
One thing that women need to understand is that the Oedipus complex is real. All men have to deal with it, and if they don't, bad things happen. Its tricky to deal with, and how it is dealt with can affect a man for the rest of his life. If its dealt with badly, it can lead to a love-hate relationship with all women forever. If not dealt with, it is possible it would lead to violence against women.
There are no easy answers.