I think it's a bit much to voluntarily withhold lifesaving treatment for someone in need because you're angry that your government made a bad policy choice.
I don't know why my family should have a say either. I guess it's pressuring them in a way, but dying generally puts pressure on one's family regardless.
Cremated, buried, put out to sea on a flaming raft, whatever. Who cares if the corpse I left behind is short an eyeball, a couple tendons, and a liver?
More importantly, if those body parts can be used to save someone else's life, I don't believe they should even have the right to care. People who are still alive and need an organ to survive are more important than whatever squeamishness and perception of agency my family might have.
The concern that doctors could theoretically let people die more easily to get their organs is another matter entirely, but that's not the topic in this sub-thread.