The evidence of anti-governance is there: Greek people have staged debilitating strikes, violent rampages and tax revolts. Greece, for its part, will be well-advised to simply leave and let the IMF help it pick up the pieces.
Let 'em go. Let 'em make their own way until they change their minds and rejoin the club and adhere to existing rules. If that means another recession, or even a depression, better now than at some time in the future when damage will be even greater.