Sailerman is afraid and guilty and hides it with fame

Sailerman knew how dangerous the blight was and judging from how quiet he became when he saw the Demo, also feels atleast a hint of guilt about getting him trapped and caught.

Which is why his brazen attitude is a sort of front to distract himself from the realisation that he truly doesn't know what he is dealing with and has gotten people killed

I also think the blight is just letting him do this because it's free victims, and it absolutely doesn't help that Sailerman leaves out how to leave the game