They usually say that forgetting about your "past" lives allows you to continue on with your "current" life without dealing with all the baggage from the last one. Granted, I don't believe in reincarnation, but I've studied it a lot in an unsuccessful previous attempt to believe in it, and that's the answer I always found to this question.
You're right; you have a very vivid imagination! You cannot remember a past life because you never had one; there is no such thing as reincarnation.
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.