I've just watched this on itv player through floods of tears. I feel so sorry for everyone involved - feel so sad for Christy - I hope he didn't suffer at all 
I suppose the difficult thing with mental illness is that there is no way you can possibly know what someone is capable of doing. The sad thing is that it usually takes something tragic like this to happen before people take notice.
I was in A&E a few months ago and there were two people in the department who were (I assume) suffering with mental health issues. They both seemed pretty "normal", and one of them was actually asking to see a psychiatrist. He was wandering around the hospital corridors getting more and more irate that he could not be seen. To be perfectly frank, he was scaring me a bit, but there just didn't seem to be anything they could do, or anyone to help.
The other person was being seen by a psychiatrist, I think, but was desperate to leave. They kept asking her not to leave, but she was adamant. There was a big "argument" going on between her and the doctors and nurses, and I think eventually the police were called, which I can only assume would have been even more distressing for her.
I'm not sure what the answer is, but I just feel that from these two incidences and the programme last night, that something really needs to change. I'm not saying that people with these episodes should be chained to a bed, but I would have thought there should be system for keeping them safe and secure in a hospital (especially if they have gone there voluntarily in need of help).
Jemba - I am absolutely appalled that you don't get many genuine cases. I cannot imagine why people would abuse the system like that.