The stalker probably isn't angry or truly concerned about anything but multiple victims reporting his/her/their activities. This conclusion is based on the specificity and timing of the claims in the e-mails sent to harass, in that they demonstrate access to privileged demonic scuttlebutt in some places.
NOTE | The stalker's foreknowledge of the specific injuries that were later incurred is of most concern.This alone suggests a collaborator with (and friend to) demons.
Cyber-harassment coupled with other forms can lead to suicide
The other victim suggested that part of the impetus behind his decision (and perhaps others') to assist federal law enforcement is one of the dire consequences of harassment to its victims, particularly, suicide [see Demons prefer suicide to murder]:
Since this case is local (having occurred in a demon-run town), and demons do prefer suicide to murder, and there's no way this harassment went unnoticed by same, I'd be more concerned about other influences that were undoubtedly present while leading up to the suicide.