I think your description is reasonable, however I'd argue that they are not security cameras. Rather a nationwide public surveillance network intended to circumvent the 4th amendment.

Flock doesn't secure people or property. They merely catalog the movements of people and vehicles for future law enforcement work, allowing both current location searches and comprehensive retrospective location history searches, all without warrants or court orders. Again, not picking on you here; just adding some color because while security camera is easy to understand, it also has a connotation that is quote different from what flock does.