Thinking allowed, and aloud.

Okay, the difference between mass killers and serial murders is apparent. The first explodes into rage and kills suddenly and violently knowing he will be caught, killed, or intends suicide.
The serial killer is driven, ‘not by a slow-burning rage that erupts one day in a single, cataclysmic act of gun-crazed vengeance—but by a profound sadistic lust, a terrible joy in inflicting suffering and death on helpless victims.’
Therefore, the question is: why did Jack the Ripper kill women so quickly they hadn't time to cry out or show defence wounds – Mary Kelly excepted.
So what did he gain from slaying? It’s almost as if the women aren’t important. Okay, they’re not important in any serialists’ actions, but Jack the Ripper didn’t inflict pain on his victims – he didn’t torture them. He dispatched the women quickly, much as a slaughter man kills an animal in an abattoir – speedily and as humanely as possible. So what was his motivation if it wasn’t the fear on those women’s faces?
Just knowing he could kill and get away with murder? Showing his power, but to whom was he displaying his prowess? Not the women. They were no sooner in is orbit than he killed them. He was showing off his ability to capture, control, and escape, to who? Proving it to himself? He didn’t doubt his skills. His belief in his abilities caused him to place himself in sites of maximum danger – Two police constables Mitre Square, with minutes between beats. An ex-policeman worked as night-watchman, and a policeman lived on the square. It was a contained location, with just three exits, two of which encompassed the beats of the two officers on duty. The third exited into St James Place where a night-watchman oversaw a building site, and just to add to the potential difficulties, St James Place was the site of a manned fire station. Miller's Court had but one escape route.
Jack the Ripper was displaying his bravado and demonstrating his ‘skill’, but who did he seek to impress, or ridicule? Was he saying, “I outwit you.’ And consequently, ‘I am smarter than you.’ To whom was he shaking his peacock tail?
So, the question is: who is The Boss?
Even if a newspaper marketeer wrote the Dear Boss letters, who did the journalist (when he adopted the Ripper’s persona) think Jack the Ripper wrote to when he dipped his pen in red ink?
Boss: A person who exercises control and makes decisions. A person with control over workers. What was the organisation or company?