If it did occur, such overstepping of the confines that society has laid down for the central bank mandate would undermine central banks’ independence and the legitimacy of their instruments and would ultimately pave the way 5/8  BIS central bankers' speeches  for higher inflation.
In the light of these risks, how can we be sure that the measures taken fall within the ECB’s narrowly defined price stability mandate? Conflicts with the price stability objective could indeed emerge from monetary operations that support unsustainable government finances. There is no doubt that monetary policy has had beneficial effects on government finances.