In what cases are detaching from events necessary?

I think you're making it more complicated than it needs to be. You just need to remember two things.

The remaining references preventing garbage collection has one more effect that may be obvious but nontheless not yet stated in this thread; the attached event handler will be excuted as well.

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.