According to this report, the IMF knowingly lent more money to Greece than they could possibly pay back:
Sound familiar? This is the thesis of the book Confessions of an Economic Hit Man by John Perkins.
Yes, finance is used as a weapon. And yes, Greece got screwed.
Not much we can do about it now, unless we're willing to abandon the current economic system imposed by the US on the rest of the world after World War II.
And if you have been paying attention, you know the current US animosity towards China, Iran, and Russia stems from a desperate attempt to not lose control of that system.