Actually? Mandatory organ donation doesn't seem like the worst idea ever, if we're talking post-death at least. I mean really, you're not getting any use out of them anymore...
It's my understanding that when the Baku found the planet it was already claimed by an interstellar power that later ceded the area to the Federation. In short, at best the Baku were ignorant of the existing claim; at worst they deliberately flaunted said claim.
And what happens when a doctor lets a man die because he knows someone needs a heart in the hospital? What happens when someone feels that their culture is violated by cutting into the dead body and removing anything?