Yeah, he should move out and you should tell the police. If not, he'll do it to another girl. One day he'll go too.
She shouldn't even ask, she should've just done it. He molested you, which is wrong and he knows better.
Your step dad had no right to touch you. Should he move out? Well if it's your mom's place that decision is up to her, and personally she should kick him out.
However, your 19 years old, and your more then capable yourself of moving out and getting your own place.
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.