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What a noble attitude. You're to be commended, I'm sure.
Suppose the suicide was a family member who took an overdose, and you came upon him/her while he/she was still alive. Would you call 911? Or would that be lowering yourself too much?
I'm sure the culture of death considers that to be "imposing" your will on someone else.
If it was analogous to the subject in question (Mr. Pratchett choosing to die after years of consideration in the face of a horrible disease) I would respect their wishes.