Simple answer to this is to gather evidence, file a lawsuit and divorce him while battling for full custody and the evidence should help a big deal. How could you of put up with this piece of scum for so long? Also about your update, don't leave your daughter.
If you leave the problem and continue getting her help she will thank you and look up to you more in the future. Don't leave her as you are the only one left for her. All your gonna do is really gonna make her commit suicide in the future if she gets adopted/foster care.
Don't be like him, your no better so don't play victim. Do all you can right now and start a new life with your daughter, and don't call her a burden. It's not a burden cause the gift of raising a child repays all the crying, screaming, and whining 10xs over.
Also helping a child dealing with abuse, you'll be paying her over 100xs over. So don't be like him and don't do something he would do. You both sound like horrible parents, you don't do jack squat.
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.