This is for two reasons. 1) To protect models, if something was to happen and a train derails, we do not want the cars or engine to fall to the ground. It will be bad enough to have them on their sides.
2) For scenic looks. It looks better if there is scenery between the track and the edge of the module. 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.