OK, I'll try to shed some light on why this subject tends to inflame some of the europeans nationalistic sentiment with a concrete example:
1. Meet Portugal (my country). Some may know us derisively as the P in PIGS because of our financial problems (much similar to the Greek one in nature and extent).
In 2010 and 2011 as one of the 14 member states of the EU that were part of the Greek loan facility Portugal contributed with 1102 million euros into the 52.9 billion loan that greece received [1].
Yes, that's correct, not all of the debt that people are so eager to expect that German forgives is from their coffers, it was actually pooled from the following countries: Belgium, Cyprus, Germany, Estonia, Finland, France, Ireland, Italy, Luxembourg, Malta, Netherlands, Austria, Portugal, Slovenia, Slovakia and Spain.
2. As you may know, about the same time we had our own problems and also had to be bailed out. As part of the measures put in place to reduce our deficit a massive tax hike was implemented in the end of 2012 [2]
I'll draw attention to single one of those measures: the 3.5% extraordinary tax on the income paid by every single person with income above minimum wage (485€/month) including pensioners.
Now, for the money quote [3]: "Minister of Finance Vitor Gaspar said the tax would bring in 1025 million euros".
Less than what Portugal contributed to the Greek bailout fund. 3.5% of the income of every citizen in this country.
In conclusion, that's one of the reasons for the nationalistic outrage against Greece defaulting the loan. It is not only the money of the richest bankers of Europe that won't be repaid, it is the taxpayer money of each of those countries that contributed to their rescue.
To put in perspective, 1102 million euros means that default would cost every inhabitant in this country 110 euros (about 330€ per household) and not only hypothetically but in practice too as demonstrated above.
EDIT: Changed second link as it was paywalled for the same news, but on CNN
[1] http://www.rekenkamer.nl/english/Publications/Topics/EU_gove...
[2] http://edition.cnn.com/2012/12/31/business/portugal-fiscal-t...
[3] http://www.eurofound.europa.eu/observatories/eurwork/article...