Re: dependents, should you not be allowed to kill yourself if someone (let's say a selfish spouse rather than your infant child) depends on you? That might even be the reason you don't want to live anymore...
At least in the case of children I don't think one should be able to since the cost of caring for them is transferred to society. It's also pretty shitty for the children to lose their parent. Is the death of a parent worse for the children than witnessing that parent be in a perpetual state of misery? Harder to say.
I can agree on children, was thinking about the other case