The European whiners are looking for scapegoat for their overspending. The bankers themselves are on the hook for losing money if Greece defaulted. Greece politicians are democratically elected. This just means a breakdown of their audit and oversight ability. It was the EU regulars who were debating whether to call these "loans" or some other junks, and they decided to not call these "loans" to hide them from the book.
If they truly think the bankers are at fault, let Greece default, then the bankers would be hurt as well. The blame will spread evenly then. That's how capitalism works.