As far as I remember $facebook -> getLoginUrl can take parameter cancel_url which contains the link, where user should be redirected if he doesn't give your app permissions.
Here is the working code : Please check it.
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.