For me, it's the irreversibility that's the real issue. For any situation that would warrant pressing the suicide switch, would it not be preferable to press the analgesia switch?
Not necessarily. If I believed that my continued survival would cause the destruction of everything I valued, suicide would be a value-preserving option and analgesia would not be. More generally: if my values include anything beyond avoiding pain, analgesia isn't necessarily my best value-preserving option.
But, agreed, irreversibility of the sort we're discussing here is highly implausible. But we're discussing low-probability scenarios to begin with.
via.
Sounds like sour grapes. I'd heard of people holding such sentiments; this is the first time I've actually seen them expressed myself.