Wannabe, I already answered the bereavement question:
"So you would all support this decision for someone recently bereaved"
Yes, I would support their right to make their own choice. the same way I would support someone's choice to have an abortion.
You say of the parents "they were most likely not in a good place to make this decision rationally". You are missing the point entirely. They did not make the decision. Daniel made it for himself. We really have no idea what he was going through, we have no idea what counselling he had, we have no idea about anything other than he found his life so intolerable he had tried 3 times to end it.
"...someone with a severe disability which limits their independence should be entitled to assisted suicide under any circumstances?"
If that is the choice they have made then yes.
I find it ironic that had he not been able to pursue assisted suicide, this man would in a way have been penalised because of his disability. As I have said before, had he had the use of one hand he could have done it himself and this story would not have been news. It would have remained a story in the local press and people would just have thought how terribly sad it was. He is being viewed differently because the severity of his disability meant he could not commit suicide in any dignified manner.
I am not saying I agree with what he did or with how his parents accompanied him. No one has been hurt bar his family who would have been hurt more had they had to watch him starve himself to death. I defend his right to make this decision for himself and for others to do the same.
I would not defend the right of someone to make that decision on behalf of someone else (the disabled child scenario you are putting forward) as the person would not be making the choice of their own free will and in full knowledge of what they were doing. Living Wills are a grey area which could potentially be misused as you could argue the person could have changed their mind.
WRT the bereavement scenario, plenty of people commit suicide over just this kind of thing. If a disabled person wishes to kill themselves for the same reason and needs help to do it, are you saying they should be denied the right that an able bodied person has?