Re: "You should have heard him defend you.." - really??
He should never have been down there endangering spock's life in the first place, and though morally it was the right thing, he did alter the natural development of the Nibiru native population, and broke Starfleet's #1 directive of not interference.
There is no further development period without the interference.
"I tell you what you all need, you need to take a thirteenth step, down off your high horse." - Hank Hill, King of the Hill