This is a good point.
America's leaders, most of them, are telegraphing to the world that we have no principle except bread and circus. Take what you want, kill what you want, just make sure we get back in time for Entertainment Tonight.
Such a culture will be viciously attacked.
Such a culture will die.
In all honesty, Padre, this news is almost in the category of "Move along; nothing to see here."
Greece has had its share of anarchists, with a few brief interludes, since the early 1900s. These groups are very small and are motivated by a sort of anti-capitalist desire for, well, anarchy. On occasion they focus on US interests with the usual excuse that we are hegemons, bloody capitalists, anti-Greek, supporters of dictators, etc. Usually their targets are banks; indeed yesterday they firebombed 3 banks in Athens. Its simply what they do. These characters, I'm telling you, are right out of the Black Hand and Sacco and Vanzetti except that they almost never injure, let alone kill anyone (though in the past they have indeed killed people, Americans, British and Greeks.
There is also something in the Greek mentality which drives them to "give the finger" to authority figures, especially their own. On Tuesdays in Athens, if the weather is any good, the students from the university often riot...for no particular reason except its Tuesday and they want to give a collective "Nah!" (that's a bad thing in Greece)to whatever government is running things at the time.