Apparently, Greece owes Germany $80+ billion dollars[1]. Of course, if it were up to Greece alone, they'd prefer to say "just forgive our past loans and let's reset the odometer to 0 for a new set of loans. And oh, btw, don't expect to get paid back on the new loans either since we don't want your input on how to reform our ineffective government to even make payback possible."
People want to interfere with Greece because they took lots of other people's money.
If a company borrowed money from bond holders and timely payment is not possible, those bondholders can pressure the company to hire their turnaround managers in return for refinancing, or force it into bankruptcy and seize assets.
Whether it's a country or a company borrowing other people's money, it's hard to see how a "hands off" policy by the lenders would be possible.
[1]http://www.marketwatch.com/story/heres-how-much-greece-owes-...