Normally it should not be so easy to refute this editorial with a counterexample, but...:
Greek court acquits farmers who shot 28 Bangladeshi strawberry pickers
The Guardian
30 July 2014
http://www.theguardian.com/world/2014/jul/31/greek-court-acquits-farmers-shot-strawberry-pickers
The article you linked reveals another potentially serious problem for Greece.
The headline says that 28 laborers were shot, but the body of the article reports that only four were seriously hurt - apparently none killed.
That indicates a potentially serious deficiency in marksmanship training.
But seriously, the Guardian may be be engaged in slanted reporting, to advance their leftist worldview, as they usually do.
I would not be surprised if it had actually been a violent mob of Bangladeshis, demanding a change to previously agreed payment terms, storming a few people who happened to be armed. It seems like there might be more to the story than just this spin.