Why, in that framework, should MAiD not be offered to someone in a major depressive episode who genuinely believes that life is pain and they’d like to end it?

Why, in that framework, should MAiD not be offered to someone in a major depressive episode who genuinely believes that life is pain and they’d like to end it? I understand the intuitive appeal of what you’re saying from a secular perspective, but I don’t see how this could possibly lead to a functional standard beyond a free for all.