Because in the listNode d'tor it's deleting the next node. So, when it goes to delete the second node in the list, it's already deleted.
You're deleting head->next twice; once in the listNode destructor, and once in the loop.
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.