i know there is a lot of differences, and i agree with you all... but im talking about a thing in an almost subliminal level... greeks, persians, whatever... what the scenes picture are "ocidental" people killing "middle-oriental" dressed ones, wearing turbans, etc, like they dress until today. And this things stay into the people minds, so when they see it happening in the "real world", its not shocking, cause they already saw it happening in the movies, and think its normal, or even right.
I hope i had explained better now. Re-reading my first posts, i realize they were not clear enough about what i did mean.