It is on the fiscal policy issue that Tsipras plays the game with Berlin. Public expenditure, in Greece, would lead to a decrease of the debt, but this is the crucial issue that for the Communitarian orthodoxy is difficult to accept.
If Greek citizens vote in a government that repudiates austerity and wants to re-negotiated the public debt, who might be next - Estonia (election 1 March this year), Finland (19 April), and/or Spain (20 December)?