Again, despite your attempts to seemingly imply things must be "black or white", the majority of our legal system is cached in a fair bit of grey area. For me personally, I'd be more apt to see it expanded over time to incurable chronic pain than with emotional pain, because to my understanding there's no "emotional pain" that is not in some fashion "curable" in some fashion of treatment with the issue. Admittedly, not a doctor so can't speak fully on that, just going off my current knowledge.
Many people want to pidgeon hole this as a all or nothing type of thing, or use the "slippery slope" argument like anti-gay marriage folks clinging to the notion that somehow that's going to bring about 8 year olds sleeping with horses. It's just not a reasonable argument.
For me personally, as with almost all laws, I look at it as a balance of a number of factors. Here, balancing individual freedom with what's beneficial for soceity and with the governments responsability to protect an individuals rights.
I see a higher standard needed for instances of assisted suicide than non-assisted, based on that balance. I see a different standard in terms of an underage person and someone whose a legal adult. I see a MASSIVE difference between an individual choosing it nad the state choosing it. I see a different standard as well in terms of the rationale behind it, or what actions would need to be taken first, etc.
Like most issues, it's too complex to boil down into a black and white....however, like most political issues, those who are firmly entrenched in either the black or white areas refuse to present it as anything beyond that because their argument survives ONLY through the use of emotion as a cudgel to beat their point into people.
