Stop assuming that all or the majority of Americans act like this, because thats just completly fales.
The reason why you hear the voices of the "idiot" Americans is because evey body else pushes their voices and comments towards the for front of every bodies attention.
I know someone posted how the Japanese military attacked the Pearl Harbor naval base unprovoked and than at the end of the war the USA dropped two Atomic bombs on Hiroshima and Nagasaki. Two things that weren't mention about the bomb drops was that the USA actually detonated a bomb off the coast of Japan hoping that doing so would cause the Japanese Emperor to surrender as the American President did not want to drop the bomb on mainland Japan. Now keep in mind that I'm not saying that it was a good idea or that we were right in dropping the bombs, just wanted to let that known before this next comment. but the Pacific war was going to end in Japan one way or another. By the time the decision was made to drop the two Atomic Bombs, alternate plans were being made to invade Japan. Now imagine that if America did go with the plan to invade Japan, millions of lives would have been lost and most likely the war would have lasted another couple months or years instead of weeks. Again i'm not saying that either decision was the right decision, but the American president choose the lesser of two evils. A million+ lives and billions of dollars in damages to cities and keeps a massive war going longer or two cities, hundreds of thousand lives lost and a few million dollars worth of damage that ends a war quickly.
Anyways, not all Americans are spiteful and evil, infact the majority are the opposite. Its just the voices of those that are dumb, uneducated and spiteful are made louder and pushed towards the forefront of every bodies attention.