If it is true that my crossdressing began because of the trauma of stepping on a board with a nail sticking out of it at age five, then I can extend the line of deduction farther.
Perhaps I was steered to step on the nail by bees that were angry that I caught some of them in a jar filled with gasoline. They would have known full well that my aggression would have been altered by stepping on the nail. Aggression was exactly the issue with them. I don't know if they foresaw that I would become gender identity disordered. Being centered on aggression they very well might not have.