Yes, I'm angry. I try to keep from seething and spitting, but sure I'm angry. Does that offend you?
You'd be angry, too, if you saw things as I do and saw so many families in needless suffering and confusion. You'd be pissed as hell if you knew that no matter how much good information a parent gets they are comparing it to all sorts of equally authoritative nonsense they're hearing. You'd want to get a sandwich board covered with angry exclamation points if you knew how hard it is to see your beloved child imploding and have no idea what to do.
There are REASONS for anger. Anger is alarm, urgency, frustration. It isn't an inappropriate scene at a nice party - yes, I get angry. Let's talk about it rather than assuming my emotion is the problem.