It was that this issue that prompted my wife and me to DA back in 1989. We did so because we wanted to make sure there was a public record (so to speak) of why we left. However, I've always maintained that you need to follow your own conscience.
I know many here are opposed to sending in DA letters, over the years I've seen lots of comments about "don't give them power," "don't play by their rules."
Now we have people telling others to just leave, that staying in is hypocritical. I say, since somebody is going to get pissed off no matter how you do it, you should just do what you want.