I don't think you can agree to have your relative's organs donated if they're not on the list, although I could be wrong
\Seems silly that grieving relatives can veto a decision which would potentially save several other people's lives. You can understand why the right to do that is in place, but still, I think rational decisions should be made by doctors, not emotional decisions by family. If it was just a given thing that everyone's organs were donated when suitable, then it wouldn't be sucha big emotional thing.