Well that is maybe what it is. But you shouldn't forget that in Greece there are violent riots every now and then. And they will only get worse. It is always possible that radicals spy out military bases to get access to weapons and explosives.
I just mean as game-developer, you do not travel to military bases without asking very nicely first, and if you are told no.. well sucks to be you, Greece mainly has German hardware anyway ^^.
But as for why this reaction in from Greece... I do not know. I think the nerves are strained in Greece. It's not a good place to be right now as a foreigner.
And yeah, my snippish first post mainly targeted at the fact that this isn't exactly the first time ;p