The USA is indirectly responsible for the Hindenberg disaster. During the late 1930s, the USA put an embargo on helium shipments to Germany. That caused Germany to switch to hydrogen gas to keep their airships going. The rest is history.
We're blamed for every other bad thing that happens in the world, so why not that?
Of course helium at that time was unbelievably scarce and was also considered essential to our own military needs since dirigibles were being adapted for war use. It was also unbelievably expensive.
The Germans could have easily asked for a waiver of the helium act and it would probably have been granted, but they didn't. People who've studied the matter say the cost for enough helium to lift the enormous Hindenburg was far more than the Germans -- still in a major economic depression -- could afford. They themselves opted for hydrogen.