yeah...I got that part.
If the part about threatening co-workers is true - that is indeed very strange, but it only shows he was a man coming unglued.
Why was he coming unglued?
It could be he really was guilty - or the pressure of the investigation drove him batty.
I hope they will be able to get to the bottom of it, but so far it doesn’t look promising.
I guess you've never been harassed by law enforcement before.
You really should read up on totalitarian investigation tactics. Pay attention to the parts about breaking the will of the suspect.
Even a cursory understanding of the causes of effectiveness of propaganda sheds light on the power of the "dripping faucet" effect.