The key point is that there is an agreement that all involved parties including the Greek government have signed. If the agreements were now seen as being open to renegotiation, then for instance the Portuguese prime minister would have difficulties facing his parliament and explaining that he is to implement reforms. I think that would be a very dangerous strategy.
What remains is to limit market liberalisation, where our societies deem this necessary. This is not a convenient truth, because it means we have to look for answers in less clear waters: we need to find those areas where global cooperation and harmonisation is sensible, and how far it can go.