A child needs parents that they can love without feeling like they are betraying the other parent. If one parent paints the other parent as the evil-doer, that becomes pretty darn hard.
I agree with this, as hard as it may be. My son needs and loves his dad. It would come back and bite me if I was to push the issue about the affair, morality, who caused what, etc. I have backed off of it completely. He believes what he needs to believe right now, so he can love and be loved by both of us. In the end, that is what is most important.
OT - I want to respond to you over on my thread, because my response got really long....