I had a director-level employee 10+ years ago that made everything in life about serving him. He was a smooth talker, a con man, a pathological liar, an accomplished orator and communicator, a thief, an actor, technologically savvy, maybe a drug addict, and an ordained minister that occupied a pulpit on Sunday mornings. I caught him red-handed stealing $30K+ (credit card fraud, EFTs to pay personal bills, obfuscation, etc.), and somehow, after much wrangling with lawyers (mine and his) he managed to produce a teller check for the full amount of the theft, plus the cost of our CPA, our attorney, and a computer forensics expert that helped us put the case together - in exchange for us not pressing charges. First contact with his attorney after exposure included a threat to sue me for "Inadequate Supervision," to which my response was, "We'll see you in court." One of the clinical people on my Board, who is qualified to make such a diagnosis, said the guy is a textbook case Narcissistic Sociopath. He had at least five other cons in play that were exposed when I outed him on the theft. This guy was incredibly convincing and seemingly sincere... what exposed him was his constant need to be aggrandized for and in everything, and the fact that liars, even really convincing ones, eventually trip over the truth. If he could have gotten a handle on the self-aggrandizing thing, he might have done some real damage and moved along before we discovered him. He has been the subject of a presentation on fraud that I co-presented with the Florida Department of Law Enforcement... my part was how to handle it if you are not going to press charges, and are only looking to recover losses, and FDLE's part was how to handle it if you are going to pursue criminal charges (because much of what we did would have been inadmissible as evidence in a criminal trial).
All that to say, there are people all around us at various degrees and stages of these sorts of social/mental disorders, and most of them will show their hand at some point if you are cautious. The guy being discussed in this thread sounds like he's in that camp. Most sociopaths are not capable of feeling remorse or guilt, so appeals to their better nature is not an effective behavior modification technique, while being exposed and facing the consequences of their actions is often terrifying to them.