> I agree, but an advantage over whom exactly? In this case it's simply an advantage of the ruling political and economic elite over European citizens (Greeks especially).

Not quite, the problem are extremist and populist political parties who abuse any crisis to force their way into relevance without playing any constructive role in any part of the problem. There's a long list of examples in European history of how extremistm exploits economic and financial crisis for their own self-interest and in the process causing a long steam of suffering and misery. It happened often enough to enable us to learn from that mistake.