What is the role of the Mosque in Jihadism?

What role are the over 3000 Islamic mosques playing in making a Manhattan type bombing or another 9-11 possible in the US? It only makes sense that the Imams and the teaching in the mosques are either telling American Muslims it is a sin to destroy and murder or they are telling them how to best murder and destroy. What is the role of the Mosque in Jihadism?

The ignorance of the media and general population towards the obvious

How does one deal with the media and general population who decide to ignore the obvious facts?