The conspiracy is part of the appeal. Even psychologists say you should lie to hide adultery. They say that telling your spouse about an affair is something you do just to make yourself feel better. I can't imagine admitting it. It would have run contrary to my lying nature.
Some lies can ruin people's lives.
Those are the ones that you go to hell for. I know that because I'm in a hell now for lying. I didn't do anything much else but lie to get here. I never killed anyone. I may have committed adultery, but not too often.