Just tell them you no longer feel the job is for you. You haven't even started yet, therefore a relationship hasn't been developed. It would be much harder if you started and got to know them, and then wanted to leave.
All you have to do is call them.
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.