> [Googlers live in a] vicious culture that can fire someone like Justin Poehnelt [...] without a clearly articulated reason
At the end of the day, nobody other than Justin is owed a clearly articulated reason. Not other staff, and certainly not members of the public.
If you were the one fired, would you want HR to announce that you were fired for taking Sundar's special cookies out of the cookie jar labeled "For VIPs ONLY!!!"? That seems like a trifling reason to me, and maybe not justified. But maybe I don't agree with the general population, and maybe that would be held against me in the future.
As the recipient of that information you're welcome to share it. And I haven't seen Justin clearly do so. But I would wager that in most situations it's better that the company stays silent.