Prove that Andrew has NPD. Otherwise, you're levying a personal attack. The only thing I'll accept as proof, and anyone should accept as proof, is a professional diagnosis that Andrew released, as that's the only ethical way to make that claim.
Is your entire defense of Andrew's actions based upon you feeling that I, a random internet commentator, must prove some unrelated accusation that you personally made up and ascribed to me?
Because that does not sound like a reasonable justification for Andrew's actions at all.
I don't think there's anything to defend. Quite the contrary, I think the people that are antagonizing someone for nothing owe Andrew an apology, including yourself, for defaming Andrew here.
Of course, that must be why the response from the free software community, particularly as expressed on HN, has been so overwhelmingly positive and supportive.
Clearly, Andrew doesn't need to defend any of his actions for anyone.