Because in most cases women possess stronger verbal skills than men, and so get to set the terms of the debate.
As an example; how many men would pick up on the intrinsic duplicity of a woman that holds him responsible for his bad behavior, yet simultaniously predicates her bad behavior as a response to him?
Bloody hell, does that ring a bell.
Some years ago I was going through the breakup of a relationship. I was walking past the couch one morning, and noticed a small piece of paper on it. It was a message someone had written to My then fiancee, which in essence let Me know that she had been 'intimate' with him.
That was it for Me. I confronted her with it, and informed her that we were going our separate ways henceforth, the traitorous wench! Did she show the slightest bit of guilt or remorse concerning her actions? No, her position was that I was the worst jerk in the world for obviously having been snooping through her purse.