You're not thinking this through. Of course it doesn't cause the country to fall apart, but it could be a cause of
part of the problem.
The Olympic Games are Big Business. When Vancouver had the Winter Games, there were a lot of people displaced, and they were rightfully furious. There were instances of "where did the money go?". Construction projects were started, stalled, and got into trouble. They even remade part of a freakin' mountain highway from Vancouver to Whistler to please the IOC! Now I don't live in British Columbia, but I've seen in the newsfeeds how upset and angry the people are who were affected by all this. I'm sure the tourists came and had a wonderful time, and BC will reap some reward of repeat business.
However, this doesn't help the people who got screwed over. And the Olympic Games also creates debt to the host country and city. HUGE. Just ask Montreal. Or any of the host cities that had to pay for all that extra security since 9/11.
All I'm asking is if Greece's problems now were caused in part - IN PART - by the huge expenditure of money they'd have had to pay for the privilege of hosting the Olympics. 'Cause it's not cheap - not for any country.