First of all, I'm going to operate on the assumption that this is a hypothetical situation, because I am sure you're aware that discussing staff decisions is forbidden. Luckily, I know of no scenario currently that sounds anything like this, so we'll keep it general.
There's a very important thing you just said there. Discussing staff decisions if forbidden. Any discussion. If you feel you've been wronged, then tough. I've always been uncomfortable with a rule like that. There should always be a place for reasonable discussion. Which we can't have, so we have to keep it hypothetical.
Secondly, there is obviously a potential conflict of interest, but I would think that one would have to have a very low opinion of the GMs in general to think that "we can't trust the GMs to actually penalise people from their own community the same way they are penalising others."
GMs, and indeed EGMs, are human, and not bots. Humans are flawed. I'd counter that you'd have to have a very high opinion of your fellow humans not to think there's a possibility of the influence of both country and friendship. Or indeed, its ugly cousin, the hatred of certain nations.
Finally, the thing is, you'll never know in that hypothetical case whether he sanctioned the Greek manager, nor would you (or should you) know what sanctions were applied against the American user
If I am sanctioned, I don't know if my counterpart in Greece, America, or the planet Zarg is sanctioned. Its an opaque world we live in when we're sanctioned. Another problem I have with removal of posts, is that I'm only aware of what I said. I've no idea what was said in reply to me if I don't read it in time. The user from the planet Zarg was able to see what I said and reply, but I am not quite blissfully unaware of what he said to, or about me.
I'm aware that by signing up for the game in the first place, I agreed to accept the game as it is. I don't however feel hypocritical by disagreeing with rules, while still (usually) obeying them.
I'm simply not used to unquestioning obedience.