There's a lot of volunteers out there that are watching the mosques and noting which ones are radical or not that pass on their info to LEOs. That really helps. Citizens can contribute a lot more than they think they can by just being the eyes and ears of America. As long as they don't put themselves in harm's way by being confrontational or escalating tensions it's helpful. Even though we know what their end game is we have to stay within the lines to keep it legal. Evidence obtained illegally is counter-productive as it falls under the fruit of the poisoned tree doctrine and can't be used (like breaking into a mosque late at night and finding weapons will land you in the slammer; see them entering or exiting the mosque with Class III weapons in publicly accessible space and it's good). Volunteers that are former military and LEOs are especially helpful because of their training and familiarity with constitutional law. I know part of it is preaching to the choir...: )
I live on an Island and need to take a ferry to the mainland for many chores, etc. About 5 years ago I remember four young muslim guys in a new car in line waiting for the next ferry. There are four islands that various ferries stop at and these guys were asking a lot of questions as they took up about 5 minutes (highly unusual). Then when we both ended up in the same lane waiting, they got out of their car...it’s a beautiful area of forests, mountains and ocean all around the terminal and many people take photos. These guys were taking photos of a Shell Oil Refinery about a half mile away. (I thought this highly unusual). Then when the ferry arrived and they parked in front of me, they didn’t know how to turn off the car (highly unusual). I took down the License number and reported to Homeland Security. 20 years ago I reported an incident to US Immigration, was on tour of a Navy Submarine out of Seattle area and Muslims were taking pictures...no cameras allowed. I’m on the program!