No one in the rest of the world should blame the American homebuyer

In my opinion (no sarcasm this time) they were only responsible for bringing down the US banks and the US economy.
No one held a gun next to the head of the CEO of Fortis or Dexia to buy those "safe" American mortgage "backed"(lol) securities.
Europeans can only blame their own bankers for this mess. Shouldn't bankers know how to do proper riskmanagement?
They look like incompetent suck-ups to me.