When you are a mistress you tend to believe that there is something wrong with the mans wife, which is why he has had an affair. And usually you've not had any contact with her. So he's really the one abusing his wife, not the mistress, she's just going along for the ride.
When you are a mistress you are not mentally abusing the wife; unless you are playing little games like harassing her, that's a different story. If you are seeing him without all the drama then most likely she doesn't know. Or she's doing her own dirt and doesn't have time to pay attention to him doing his.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.