Opt-out rather than opt-in. While I would rather cryonics were also opt-out, the point is that by default someone should be opted-in to be an organ donor unless they go out of their way to express a religious preference otherwise.
post humous or pre? Blood can’t be donated without side effects and pain on the part of the donor. While a deceased motorcylist doesn’t need those organs any longer.
So this is a different issue. Current medical establishment has decided to declare living bodies “dead” the instant something major breaks they don’t know how to fix. Someone is not actually dead for some period of time afterwards, possibly hours, where no possible technology could recover their mind after that. They also have the notion of “brain dead” where again everything else works and a large amount of the brain may still be alive but the wiring for breathing and a few other base reflexes is damaged. No way to fix that so off to the incinerator they go.
I strongly feel these processes are barbaric and may one day be seen as outright evil, but nevertheless, working within this framework, organ donation for the bodies that medical systems were going to destroy anyway does make sense.