my theory:
he's involved, They will keep the data they collect
'It's "an investigation" you can't see it til we are done " ~ 75 years or more.
Something about it makes him nervous.
Or he's just playing good cop / bad cop (more likely)
?
guys a demon, so he's just playing against his type casting.
He's the centerpiece of so much blackmail, changing laws to make malicious prosecution easier.
Probably he's in some of the documents.
?