I think DW shot himself in the foot, being cooperative, and being suckered into discussing specifics of how the PG machine worked, what the graphs showed, what controlled each. They were suckering him in. He was too 'naive' to see what they were doing.
(note: this is not an attack on the police. They were doing what worked. Also, above applies whether dw is the 'angel' or the devil trying to outsmart the machine)
I think he shot himself in the foot by kidnapping and murdering an innocent child from his own neighborhood to feed his own perverse and narcissic need for domination and control.