He's struggling big time with mental illness. Would be good if you could stop him spreading stuff on social media. Not sure how, maybe trying to refocus him somehow.
There'll be a mental health hotline in your country you can ring and ask for advice, or even the emergency no. It sounds like maybe he needs to be assessed by a mental health professional, hard to know without all the facts. Definitely call a hotline though, and maybe try and get him to speak to them.
Don't tell him what he's thinking or doing is crazy, or stupid, etc. It's not to him, he's been triggered.
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.