Earlier quoted context omitted.
If I want to sell a poisonous wine to an adult that understands the risks and still wants it, then it's none of your business.
So if you want to kill a mentally ill person with their consent, that's also none of our business? Like was this guy [1] right in what he did and his punishment was unfair? [1] https://en.wikipedia.org/wiki/Armin_Meiwes
Well that debate escalated very quickly.