dave - are you confusing what you read in your newspapers with the truth - or is that the truth? I had a simple Google for the Priory Group and found:
The Priory Group - acute mental health, secure and step-down services, specialist education, complex care and neuro-rehabilitation services
It seems they do a little more than treat celebs. If someone needs psychiatric help, then I'm happy they are treating them. Of course, more knowledge of battlefield trauma would be an advantage - but as I'm not an expert, I'm not quite ready to get on the outrage bus yet.
BTW - we don't just use them for PTSD - they serve a number of other cases too.