In Garland the agent encouraged the shooters and followed them to the location where the shooting took place - doing nothing to stop them or warn anyone what was coming.
They really need to clean house and purge the FBI/DOJ/CIA/State Dept., etc. of the leftists that infested Deep State.
I have a better idea. Lets expect and facilitate "they" to destroy the permanent deep state completely, along with all its eager minions, and without regard to who may artificially identify as left or right.
The FBI and CIA serve the interests of the permanent power structure almost exclusively, which usually means they act contrary to the interests of a free people.
The CIA gives us regime changes, overseas wars, drone strikes for cultivating new terrorists, assassinations of heads of state at home and abroad, Operation Gladio to stage false flag "communist" terrorism during the Cold War, Gladio "B" to stage and foment Islamic terrorism in the post-Cold War world, Operation Mockingbird for control of mass media, and cute little projects like MK Ultra.
The FBI is closely connected to virtually every major act of terror on US soil. Every time we seem to find out, after the fact, that the FBI had opportunity after opportunity to preempt some heinous act of terror, but never seems to close the deal. That is not "dropping the ball", it is evidence of guilt and culpability. The FBI is the fireman who prolifically commits arson so he can have job security and overtime pay. Except the motivations of the FBI are far, far darker than the motivations of a fireman arsonist. I could say more on that but I'll stop now.