Yeah, it's just as simple as "because the U.S. supports Israel". There's little reason to have a discussion when it's apparently so easy for you to ignore history or how rank and file people view things from their little part of the world, especially given the way their media/educational systems work.
In this instance you seem to be unable to look at things from the outside despite a plethora of sources that the average Middle Easterner doesn't enjoy. You regurgitate the same tired crap as gospel but pretend you're somehow different and you have access to things they can't even dream of.
And it has nothing to do with "vitriol I think should be directed" at anyone. I simply understand that people who are oppressed or perceive themselves to be oppressed will on occasion react strongly against SOMEONE. Our ancestors did it and ended up founding this nation.