Imagine what it must be like to be the counselor. You have two people who have no desire to work on the marriage, but want the counselor to 'get the other person to see how wrong they are.' Not just in this case, but in most cases, I think.
I can only envision marriage counseling being beneficial if both parties are truly motivated and sincere about trying to understand each other and work on the relationship by honestly working on their own issues. And I imagine that the vast majority of people who go to marriage counseling are not of that mind.
I'm glad I'm not a marriage counselor, lol.
L