^^ That's an opinion, phrased as if it was a fact. It's a value judgement and nothing more. I respect that it's your opinion, but just because you fervently believe it doesn't make it objectively true.
If you wish to engage in a meaningful and productive conversation, you'll need to be more honest about separating your opinions from fact. I think that, underneath all the shouting, you have a very interesting take on the issue. I'd like to discuss it. But it's drowned out by your inability to recognize that other people can have a different -- and equally valid -- interpretation of what "quality of life" means.
(Also, no: You cannot "decide things" about excruciating pain. It takes over a person's ability to reason. Chronic, debilitating pain very much robs a person of their agency.)
The fact that you can identify what my opinion is and still not address it, preferring to have this semantic argument, is a great example of someone avoiding the conversation because they know they're in the wrong.