why are the defence so set against a finding of diminished responsibility, or are they hoping the court will conclude he has diminished responsibility and either acquit or be very lenient to him?
I really don't know. My gut feeling is that if he is shown to have diminished responsibility, that might call all of his testimony into doubt. If he actually lacks the ability to tell right from wrong under certain circumstances, i.e. when he's under attack, what's to say he's even capable of telling the truth when he's in that situation; i.e. a courtroom. For diminished responsibility, you're sort of assuming guilty. If you're innocent, then it doesn't matter if your judgement was clouded, because you haven't done anything wrong.
I suppose, thinking it through, that's why they're so clear on 'extenuating circumstances but not diminished responsibility'. That's what they want the witness testimony to be viewed as.
Jill, despite you being concerned about not saying it right, I understand completely what you're saying.
I can completely see OP not wanting to be labelled. He's utterly determined not to be seen as disabled, all through his life, and a psychiatric disorder would be very hard for him to take. If it is referred, if there is a diagnosis (and that's a huge IF), then I hope that it's handled appropriately.
Having said that, I think on a purely practical level for his defence team, having him evaluated for 3 days might open a whole can of worms that they might struggle to close again.
In short; God, what an absolute mess.
Also, huge hugs to you, Louise.