I listen to metal and its the same thing really. People hear metal and just think of all the 'satanist' lyrics , like the song 'Painkiller' by Judas Priest sounds like the symphony of hell but the lyrics talk about how God is a 'Painkiller' but metal like hip-hop has done for you has taught me things and has got me through some hard times. I guess your parents just associate hip-hop with gang violence and 'bitches and money' but they've probably never heard a hip-hop song that had a positive message.
They might have some specific advice that your parents might listen to. You could also ask them if they want you to listen to Christian songs like this. Https://www.youtube.com/watch?v=e0f78MDO...
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.