As a general rule serial killers are white males between the ages of 25-35. (usually the first murder will occur in this age range) Of course there are black serial killers, Wayne Williams, the 'Atlanta Child Killer', is an example Serial killers tend to hunt in their own ethnic group (race) but of course there are some that mix it up and then there is Jeffrey Dahmer who was white but his victims were black or asian. The Green River Killer, Gary Leon Ridgeway (white), killed mostly white female prostitutes but there were a couple of black victims So there are no absolutes, just guidelines that help police narrow down the suspect list.
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.