Or, to put it slightly more bluntly: each member state must “pay its own way". All this is ultimately intended to protect the single monetary policy from coming under pressure to 2/6  BIS central bankers' speeches  inflate away excessive levels of government debt through monetisation.
Second, the capacity to launch a strong policy response was in place when the crisis hit. On the monetary front, the tight, anti-inflationary stance that preceded the crisis had taken policy rates and the cash reserve ratio to relatively high levels.