——Old tricks, but they work.
Even if this play is deliberate and stupid, and many people will see through their plot. But as long as the proportion of people who believe in the Fallen Celestial Marshal reaches a certain level and continues to rise, the plan of the Fallen Celestial Marshal will succeed. For this purpose, the demons must also precisely identify and eliminate these smart people, to prevent accidental failure of the plan.
Therefore, when someone takes away those "smart people" who can see through the deception, it is actually a good thing for the Fallen Celestial Marshal's plan—because this means the potential rebels are also taken away!
If these rebels are not taken away, the demons will have to deal with them themselves.
Demons are selfish beings—they can even abandon teammates and comrades, so they definitely won't do this kind of thing if they don't have to.