There are reasons for that.
For example, the state controlled/censored media in the muslim world are infamous for antisemitic hate mongering. (State sanctioned racism... what does that remind you of?)
A second problem is that I have no idea about the spin in Al Jazeera (except for their host country). Does anyone? I can make good guesses on what to not trust in e.g. my local media and NY Times (mainly big advertisers).
Note: I'm not arguing that all (or even most) media in the US are more dependable than e.g. Bild zeitung.
Edit: I thought I should add a reference about antisemitic content in Arab media, so I checked Wikipedia and found a reference -- to Al Jazeera! (That isn't that heavily censored by any state. But fun enough that I added a separate comment with the quote.)
http://en.wikipedia.org/wiki/Islam_and_antisemitism#Yusuf_al...