There is indeed a streak of ignorance in the Arab anti-Americanism, but it is no more "the pillar" or the main cause of this ugly feature than "poverty" or "Zionist oppression" are. The guys have their agenda, and, they reckon, in its pursuit all the means are good. And they do know that America is the last redoubt in defence of the free world, so their hatred is based on knowledge, not on ignorance.
As to the Western anti-Americanism, there is no ignorance in it whatsoever, since Leftie academia and liberal intelligentsia are the main culprits.
Why, a former Australian diplomat Bruce Heigh (spelling?) told this morning on the Aussie Prime TV that if Americans didn't support Israel the terrorist act in Bali wouldn't happen! Surely a diplomat would know that the goal of the Indonesian Muslims is to create an Islamic super state incorporating the Phillippines, Malaysia, Singapore and parts of Thailand... and even if Israel never existed at all it wouldn't change anything for the Indonesian Muslims.
. . . and leftist intellectuals are ignorant of nothing.
</sarcasm>