I don't think this is as hot of a take as you may imagine. However, I think that the implementation is the tricky part.
If you think about it, anyone can try to die by suicide at any time they want, and there's really very little others can do about it. There's a thousand and one grim ways to accomplish it. In a way, providing people who really want to do it with a safe and effective process to accomplish it is, in my opinion, kind of humane.
That said, what is the safe and effective process? Who determines what is safe and effective? Personally, I'd like doctors involved, but most doctors (any one that I want to trust, at least) have taken an oath to do no harm, and they tend to take that pretty seriously. Is the government going to force doctors to perform euthanasia for anyone at all who wants it? That hardly seems like a good idea.
So the hows and whys are a bit trickier once you start digging into them, in my opinion. For context, I've dealt with major depression in the past and have spent (a short) time in a psychiatric ward after an attempt. I'm kind of sympathetic to both sides on this issue.