Allow me to ask for your view: I just calculated that from my non-Muslim facebook friends 0.1% believe in 9/11 conspiracies, while probably more than 90% of my Muslim friends believe in those theories. It's a critical question, but I honestly would like to hear your explanations. And I think it can be very helpful to hear how external people (me) perceive you (the Muslims).
Definition of conspiracy: Theory that there is a secret plot behind something. 9/11 is probably the most famous. But there are lots more and Muslims keep telling me new such theories of distrust. And I'm not sure if they've heard of the arguments on the other side? For example that the detonation of a self-made 9/11 would have been registered by a seismograph (please keep in mind that in New York City not all seismographs are state controlled!). Of course it's allowed to believe in conspiracies, though.
But since it's the Holocaust Remembrance Day today, let's also remember that in Germany there were vicious conspiracies and rumors about the Jews that led to this tragedy.