Read any of the comments on the attacks on any site (from Huffingtonpost to CNN, to foxnews) 90% of them are "pull out our troops", "stop the aid".
The people benefiting from this and pushing it are the ones who want the US out of the region. AKA look at what Iran, Hezbollah, and the Muslim Brotherhood are doing.
As for why it was made: there are 300 million people in this country. Sorry - some of them not fans of Muslims. It isn't hard to go to YouTube and find inflammatory anti-Jew, anti-Christian, or anti-Mormon videos - why were those made?