I agree with you in principle on this one Box.
But we can't afford to give the FBI the ability to use deniable agents in the US. They are simply too biased and too political. Even today, peace groups and other left wing, non-violent, protest groups are more likely to be infiltrated and monitered by the FBI then right wing organizations with long histories of violence and crime.
Worse yet, they have shown the willingness to protect criminals and even instigate crimes, when it suited their goals. Just look at the flame-up in Boston right now over the FBI and the Windhill gang. The FBI agents let a number of innocent men go to jail to protect informants that commited murder.
Jay