There are crazy and evil people in the world who are determined to harm society and other innocent people, and part of the FBI's job is to help prevent this. Th

There are crazy and evil people in the world who are determined to harm society and other innocent people, and part of the FBI's job is to help prevent this. The acceptable cost is debatable. If the FBI investigates 500,000 people and prevents a single instance similar to the photo below, is it worth it? http://11even.net/wp-content/uploads/World-Trade-Center-2002-Pulitzer-Prize-for-Breaking-News-Photography-by-Steve-Ludlum-New-York-Times-1.jpg http://11even.net/wp-content/uploads/World-Trade-Center-2002... There have been plenty of attacks stopped http://en.wikipedia.org/wiki/Terrorism_in_the_United_States http://en.wikipedia.org/wiki/Terrorism_in_the_United_States There is always the possibility of something even worse happening. http://en.wikipedia.org/wiki/Nuclear_terrorism http://en.wikipedia.org/wiki/Nuclear_terrorism A notable incident from 2013: http://abcnews.go.com/Politics/fbi-foils-plot-build-strange-ray-weapon-possibly/story?id=19440343 http://abcnews.go.com/Politics/fbi-foils-plot-build-strange-... I'm sorry if this sounds like fear-mongering, these things do happen though.