Re: Janeway's Decision to Kill Tuvix
as established in "The Measure of a Man" a person even an officer has the right to refuse to undergo a procdure that poses an unnecassary risk to their life. Data was determined to have the right to explore his own being.
IIRC, that ruling applied only to Data specifically.
"If the world was perfect, it wouldn't be." - Yogi Berra