Trevor Aaronson has reported on the FBI practice of prosecuting Walter Mitty terrorists, people whom the FBI has led by the hand into a
trying to commit a crime which was never a real possibility.
Thus it can prosecute people who would never have
committed any terrorism if left alone.
This makes the FBI look very effective, but it may not prevent any
terrorist plots that would really have been carried out. It's also
unjust.
Right-wingers have used that truth as the basis for fiction, claiming
that the attack on the Capitol was brought about by FBI entrapment.
Aaronson refutes part of their argument about this.
In addition, if that were the case, the FBI (1) would not have built
up the group to be big enough to do real harm and (2) would have
arrested the participants before they got in a position to do real
harm.