Obviously I can only speak for myself here but I wouldn't be so understanding, especially when my partner lied about such a fundamental aspect of their life and joined in a union of marriage with me.
I suppose, for me it would feel like the vows they took where not real and the foundation of our life, all the memories, thoughts and feelings were nothing but smoke and mirrors.
You're right, we're all humans and life is complex but I think it's selfish to waste your partner's life for years because you can't face the truth. I suppose that a bitter end is better than endless bitterness however.
You’ve stolen time and emotional energy from these people. They can never get those years back.
Your children have been deprived of seeing parents role modeling romantic love. They have built their entire world views based on your behavior towards your spouse, which incorporated subtle lies and deception.
The victims of your fraud now have to deal with second guessing which things you said might be true and which might be lies - you shatter everything they ever believed throughout the marriage. It is a horrendous thing to put people through.
So can I understand why they did it? Sure. But I will definitely judge them for their actions and not support them.
For the article and the many admissions in the thread underneath people can’t just pay attention to and sympathize with the perpetrator you need to take the next step an construct realistic avatars for his relationships and visualize the intense damage done to them as well.