You suspicion is correct. You are binding the grid to a "free standing" List of objects, and while each object is self-tracking, the list is not. This is why changes to existing objects work as expected, but adds/removes do not.
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.