Explain in a way that is appropriate to the cultural environment that the information they give you may be used by other like-minded researchers. If you have made certain agreements, e.g. That data will not be seen by government officials or the press, make it clear these promises will still apply to archived data. More.
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.