The combination of a "low tax" (black) , high-welfare economy, a splurge of borrowing pre-2008 when the rates were favourable, and of course now being tied to a common currency, have led to a certain position, exacerbated by the new government, which was elected on a mandate to "stop austerity".
The current impasse was wholly predictable.
Greece won't leave the EU, but it faces a choice of two evils: work out a deal with the EU and the banks which will inevitably lead to more cuts and hardship, or use a currency of their own which will devalue and destroy the wealth of everyone who has euro, and long term take the country back to a position many wanted originally wanted to get away from i.e. ploughing their own increasingly unsustainable furrow.
While one understands the (mistaken) view of many that their country is being "dictated to", when one reads banners that say "Put the EU bankers in jail" or similar, it is slightly breathtaking. If I borrowed vast sums of money from someone, refused to work out a sensible repayment plan, and then suggested that my creditor was a criminal who was destroying me and that I should be banged up, I don't think I would attract much sympathy.