I see where you're coming from with your argument, and certainly I have no qualms about the use of my organs after I die, but not everyone shares that belief and personally I don't think it's right to just disregard that. Sure, it might have been better if the families never found out, but it would have been best if the families wishes (no matter how irrational) were respected from the get-go.
Disregarding someone's irrational beliefs (every one of us has some) just like that is a sign of serious lack of empathy, and an easy way to make enemies. You can try and convince someone to stop holding that irrational belief, but you don't have to disrespect their feelings in the process.
