Yes but shutting down the whole movie out of spite?
That seems like an emotional overreaction to me.. it's not like the script will be printed on the front page of every site you'll ever visit including Google.
You'd atleast need to search for it or click a link so you'll actively spoil yourself.
I understand his emotion though because a very small circle had access to the script and one of them betrayed the trust he set in them and that can hurt more than anything. I don't want to be in his shoes right now finding out you were betrayed by a close friend/colleague.