Organ donation could be forced and no one would properly care that much all the major religions are fine with it. The main reason more people aren't organ donors is they're just lazy all the opinion polls have an overwhelmingly majority of people who support it but simply just don't check the box or go back to check the box just isn't something you really ever think of doing. As well as family members simply not knowing what the person wanted. The only other reason is conspiracy theory/fake news about how the doctors won't work as hard to save them. So it's not really a comparable argument and I guess there is no political will to force the issue and make it mandatory. It's also not a comparable argument because your removing organs from a dead person nothing will bring them back they won't go on to live another long life. There are two lives in the abortion argument.