People make the inference that because someone is nice, wonderful, loves their dog Etc. that they cannot be terrorists. Wrong, if anything, smart terrorists would build this "persona" as a cover. But joining a mosque that preaches against Israel, rants about US foreign policy, and provides a quiet place for members to "vent their disgust" over the goings on in the Middle East gives these "model citizens" a chance to maintain their level of anger. And continue the concept that their mission is sent from Allah.
It has been mentioned before that this is a so called sancturary city, set up by liberals for illegals to have free access to our services without hinderance by the law enforcement agencies. It stands to reason that these will be the homes of the most dangerous cells.