Why Does The FBI Need To Manufacture Its Own Plots If Terrorism And ISIS Are Such Grave Threats?

"But how serious of a threat can all of this be, at least domestically, if the FBI continually has to resort to manufacturing its own plots by trolling the Internet in search of young drifters and/or the mentally ill whom they target, recruit and then manipulate into joining? Does that not, by itself, demonstrate how over-hyped and insubstantial this “threat” actually is? Shouldn’t there be actual plots, ones that are created and fueled without the help of the FBI, that the agency should devote its massive resources to stopping?"