I usually see this a seperate entities as MembershipUser revolves around membership which is a generic concern and a user in your system revolves around whatever your domain entails, I do see your point of view where both these entities could be contained in one, so. Profiles is definitely the easiest way to go.
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.