I'm pretty sure you just quoted my post but didn't actually respond to anything I said.
People in pain dont want to be murdered, they want to end the pain. If the latter aint happening some choose death. Has anyone in such a situation told their kin or doc to 'murder' them? Of course not, they know it aint murder - its suicide (assisted).
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And some guy who wants to die in his fantasy aint being murdered, he chose that for himself. If you're murdered you dont get to make the rules, the murderer makes the rules.
This is you playing around with words. Yes, if a person wants to be murdered, then they don't actually want to be murdered, they just want to be killed, because if they want to be killed, then it's not "murder" in the strictest definition. This is not a moral argument, this is a word game.
Imagine however a person in severe pain, they really want it to end and have already decided that death is the only way out of it, but have not yet found the "strength" to commit suicide, and assisted suicide is not available for them. Then a random mass murderer comes around and stabs them two-hundred-eighty-nine times in the chest. The stabbing was done for the expressed purpose of murdering a person, yet the last thought of the victim may be: "It's finally over."
Your gut reaction now is probably: "But they were in pain and suicidal!" ... yes, they were. So? If a "universal response" is not actually the response people give under certain circumstances, then it's not a "universal response", is it? "Mental illness!" is not an excuse either, because it's just how we've defined behavior that is not fit for society. How a person "should" work, or "should" think, and whether they "should" want to fit into society is inherently subjective in itself.
When I said nobody wants to be murdered, I wasn't suggesting you cant invent circumstances under which someone wants to be murdered, you just haven't done it yet if thats your goal. But arguing over universal and nearly universal seems rather pointless, it dont really matter to me if you can find some crazy guy who wants to be murdered.
The case of the cannibal I linked clearly wanted to be murdered, and not because his life was suffering, no, because the idea to die and be eaten stimulated him. He actively moved to a person for the expressed purpose to be killed and eaten, and five other people had replied to that invitation, and had met with the cannibal.
So your argument is again basically: "It's a universal response, except when in rare cases it's not." ...well again, then it's not a universal response. It's clear that these cases are very, very rare and exceptional, but a single case proves that there is nothing universal to it - it's subjective, but most of us agree about subjectively better state of being.