Well, it actually makes a lot of sense. Hollywood and LA are the face of America around the world. It's a face very religious people have a hard time accepting and it's their culture that many Muslims are angry about.
Here is a "why they hate us" type article.
In his essay “Between Yesterday and Today,” Banna wrote that the colonialist Europeans had expropriated the resources of the Islamic lands and corrupted them with “their murderous germs”: "They imported their half-naked women into these regions, together with their liquors, their theaters, their dance halls, their amusements, their stories, their newspapers, their novels, their whims, their silly games, and their vices. . . . The day must come when the castles of this materialistic civilization will be laid low upon the heads of their inhabitants. "
The Brotherhood’s slogan was, and remains, “God is our objective; the Koran is our constitution; the prophet is our leader; struggle is our way; and death for the sake of God is the highest of our aspirations.”
It includes such gems as this: (2) The second thing we call you to, is to stop your oppression, lies, immorality and debauchery that has spread among you.
(a) We call you to be a people of manners, principles, honour, and purity; to reject the immoral acts of fornication, homosexuality, intoxicants, gambling's, and trading with interest.
This conflict is very much about fundamentalist Islam versus person freedom.
What's sad is that it's the American political left that has the most to lose in all this, yet they fight us again and again.
"fornication... intoxicants, gambling's, and trading with interest. "
Aw, Las Vegas isn't so bad...