It was so shortsighted and precocious to put the bailout terms to a referendum. It left them only the option to betray their people. If Greece was playing Poker, they had a 2-7 off suit and tried to bluff with it. Except that everyone knew they had a bad hand.
Greece votes to play the hand they're given and they don't seem to realize that they have no play until they get home broke.
What would you expect Tsipras to do (and how bad is it that the title of the article spells his name wrong) when his people are going to face economic collapse? He got home, sobered up, and realized he had made a really stupid mistake and that even though he doesn't like the terms that he has no better option.
It's democracy. The Greeks put him in office. The Greeks voted to reject the bailout offer last week, and this is a different, although very similar, offer. Democracy fails all the time. Having the mass uninformed electorate making decisions and expecting that they vote to support themselves in the long-run at the cost of their short-run selves is a huge gamble. Tsipras thought he could get away with it, but they have a bad hand and Germany didn't even blink. Not even a week later and they're doing exactly what they should have last week.
You don't get to buy and buy and buy and then skip out on the bill.