Because if they can just kill you off, they don't have to defend themselves any more.
Since last year, Canadian law, in all its majesty, has allowed both the rich as well as the poor to kill themselves if they are too poor to continue living with dignity. In fact, the ever-generous Canadian state will even pay for their deaths. What it will not do is spend money to allow them to live instead of killing themselves.
Part of the reason the Left is slavering for "universal" health care is because when the government controls your health care, they can control YOU. Oh, you have the wrong ideas about the government's role? Gosh, it looks like we'll have to push your cancer treatment back a few months. Ooopsie, it's too far gone now. So sad! I guess you'll just have to die. Here, let us help you, before you cost too much.
The government is a band of criminals, perverts, Marxists of every stripe, thugs, goons and incompetent shitbags. There is absolutely no reason to hand over any decision to them.