So the FBI created a criminal vehicle, put it out in the wild and arrested the people who used it. Sounds like the FBI made some terrorist stuff, found someone to use it and then arrested them.

They create criminal enterprise and then arrest users. In this case, maybe they should arrest themselves for seeding criminal activity.

All who tempt are devils. This sums up the Dark Occult quite nicely. Playing God they enjoy materialistic freedom by capturing souls with sorcery and witness against those souls.

Why can't they create things that prevent criminal activity?

Because without criminal activity they would not be able to engage in their deprived machinations which validate the existence of crime, criminals and elite demons.