Is this another troll post? As the OP's question is pretty stupid.
Laws and doctrines are fundamentally different...the government who makes the laws does not claim to have God's backing or claim it is "the truth".
Idiotic comparison to be honest. Sorry for being blunt.
Just put it into perspective...1969...organ transplants are a disfellowshipping offence based on the reasoning, from the GB, that it is cannibalism (your body "consumes" the organ they said) and personality transplant occurs meaning you are not in full control of your mind.
1980, organ transplants become a conscience matter based on blood.
So lets now have the same situation but in two different times...a brother, who is a father, has a kid who needs a new heart to survive and it is 1979...he wants to remain faithful to Jehovah so the kid dies because organ transplants are a disfellowshipping offence.
Same situation with another brother in the same hall, kid needs a new heart YET it is 1981...now a conscience matter...the father agrees to the kid getting a new heart.
One kid lives, one kid dies...both are deemed faithful and all because of "new light" "old light" shite...
THAT is how dangerous it is and is NOTHING compared to changing a law!