I believe
Charles Dallara (
http://ineteconomics.org/people/participants/charles-h-dallara) represented the big banks holding a lot of that Greek debt and they agreed to take the 50% hair cut and say it was voluntary (you apparently actually have to go and
file a claim with some governing financial market body to claim there is a default, so if they don't do it, it is apparently not a technical default
triggering credit default swap
payouts).
I think both Merkel and these big banks knew that if they let Greece essentially default in an uncontrolled manner (ala Lehman Brothers), they can't necessarily control trajectory of events afterwards and risk having another financial panic / run on those banks so much so that governments have to come in and national banks, wiping out current shareholders. So Merkel played chicken and won because she knew she had stronger hand.
Greeks shouldn't object to 50% haircut per se, since it is like 50% principal forgiveness to them. It is just the strings attached to get principal forgiveness that they have a problem with - severe austerity measures and economic liberalization of this welfare state to promote growth that they have problems with (e. g. saw segment on tv about how there are not enough taxi drivers because medallions are so carefully limited; government wants to issue more to I guess increase competition and lower taxi rates, but current taxi drivers are screaming because they really did pay a lot of money for that license and they make comfortable living because of artificially high taxi rates).
There are some smaller lenders to Greece that I don't think Dallara represented, so those people can claim real default and collect payout of credit default swaps. However, I think they don't represent systemic risk to global financial system and economy.
2008 Lehman triggered financial panic really was thought by many to risk the end of western civilization as we know it (domino effect collapse of AIG, Citibank, etc., all triggered by reckless, supposed "moral hazard of bailout"
decision of Bush and Paulson to let Lehman fail in such an uncontrolled manner); this European Lehman-lite potential financial panic I think is more a concern because of risk of putting global economy into moderate to deep recession, and not just mild or moderate recession hopefully limited to Europe alone). I don't hear people talking about putting us back into the Stone Age (financially speaking) this time around.
(At least, that's my take from what I've read).
