When you let anger and resentment dictate your policy, yes you're being irrational, by definition.
It was like 7 years ago. Now there's a difficult situation (a debt realistically impossible to pay) and different people in charge (not thieves and Goldman Sachs anymore [1]). Let's focus on viable solutions.
[1] http://www.spiegel.de/international/europe/greek-debt-crisis...