Write whatever let's you get your feelings out. It's about you, not them. Send it to everyone if you wish, though I personally see that as a waste of time because they won't be ready to hear it anymore than the elders that get it and they will see you as an apostate and shun you anyway. Seems like a waste of time and postage but if it makes you feel like you made a mark, go for it. Again, it's about you. None of them are likely to care. What makes you feel free.
My letter was very respectful and kind because that's the person I wanted to be. Others may get salty. Whatever floats your boat.