I think it is rather amusing that the US, which struggles with more than they can handle, is out there criticizing other countries. I am not saying that Germany does a great job either, but for the US to criticize any country for just about anything is more like the pot calling the kettle black.
I think before you point fingers at others and accuse the of harming the global economy you should do a better job yourself. The US with is policy is harming the global economy long-term more than any other country in the Western World, at least in my opinion.
No matter what your view is, I think the US is in no position to point fingers. They should look at Congress if they want to blame anyone for a failed economy.