One of the lessons one learns in military basic training is “situational awareness”, a term that reflects the importance of watchfulness in combat. It can mean the difference between life and death. Police practice this as well, looking for people who seem out of place in a neighborhood.
The average citizen blithely ignores this when shopping or just going about their life, though many purchase private monitoring services to protect their homes against fire or theft or put up video surveillance systems to protect their businesses. I doubt there is any public place that does not have television cameras watching.
When it comes to protecting the nation, situational awareness is an essential element to spot a potential individual or group that might pose a danger. There is, of course, the potential for misuse or abuse, but that applies to everything government does.
The upside of such monitoring is contained in a short item from the Heritage Foundation’s January 12 Morning Line dispatch. “His plan was to rip apart nightclubs with explosives, unleash a wave of destruction on bridges, and open fire on police officers—all in sunny Florida. This was the murderous intent of Sami Osmakac, 25, an American citizen from the former Yugoslavia who was determined to spill blood, foment destruction, and bring terror to the United States all in the name of Allah. Fortunately, undercover FBI agents thwarted his efforts, making this the 44th foiled terrorist plot against America."