If some how they are getting in try to completely secure your garden so they can no longer get in. This way they do not go to the toilet in your garden. Make sure that you don't have anything to hurt the cat, so when proofing your garden make sure there is nothing sharp that could hurt 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.