Consent does apply in suicide.So if your toddler wants to sit in an open, 10th story window you would let him?Consent does not apply in suicide. Anything one chooses to do to himself is by definition consented to by him.
Consent applies when you want to act in any way upon another you know like forcing people to wear seat belts or forcing people not to eat Twinkies because you believe it costs you money if they do.
If your drunken friend asks you to find his car keys you would help him?
If your sister is dumped by her boyfriend and asks for a gun you would give her one?
Neither a toddler or a drunk can give consent, they have diminished capacity. What's your point?