Liberal me halfway bought into it for a bit. ML me says, it's disturbing that this would even be a practice society would consider before exhausting other options, like community programs, better living conditions, free / low cost health treatments, meaningful shared purpose, and so on. As for the abstract of it, it's irrelevant. We don't exist in an abstract world. We live in a complicated real one and the fact is that the validation of this I've ever heard of as an "individual choice" comes from capitalist society, not socialist ones. And mental health issues are dramatically worse when people struggle to get basic needs met, or have chronic anxiety about becoming homeless because they're so close to slipping into poverty, or their entire being is reduced to being seen as a commodity they are supposed to make marketable. And so on. (And this is not even getting into health issues that can be triggered from environmental pollution and such things.)

If a person has chronic pain and you ask them "do you want the pain to end", they're going to be like "no shit, I'd like the pain to end." So what is your goal? You (society) do your best to help them live in a world where that pain is gone, or at least minimized. This should be obvious, but capitalism is sociopathic and doesn't care if people die. Capitalism just cares that the line goes up.