Wt are anti-feminist men bleating about feminism being the cause of marriage breakdown and behaving as if ....?

The reason for the breakdown of traditional marriage is the fact that it was never a realistic or workable institution to begin with, marriage was invented for the sole purpose producing of heirs and establishing economic and political alliances which is why arranged marriages has been the norm for so much of human history. Women married because the law didn't allow them any form of economic independence and men cheated because they knew that society wouldn't care as long as they didn't get caught and there was nothing their wives could do about it. Blaming a failed marriage on anyone or anything except the people involved in that marriage is just a rather cowardly attempt to deny personal responsibility for one's actions.