Good confused, and thanks for posting these letters, they are certainly eye opening and will be a help to some.
As you have changed your terms (i.e "you are always welcome to come see them" etc etc) it might be polite to tell them and the reasons why.... just to cross the t's and dot the i's and try and avoid the obvious path of them demonising you even more.
Your brain will be screaming Nooooooo, but longer term it could be a good move.