OK, animals may eat their prey alive, and we shudder at the thought, but then THEY DON'T KNOW BETTER and Ethics are not part of their being, not even as a pretence. For that kind of ideas we have to go to our own breed: Only humans KNOW that certain actions are against all written and unwritten laws of decency. Actually, that may be the very reason they do the unthinkable as e.g. skinning people alive: It's so cruel that some people like e.g. the Assyrian warriors who are skinning a couple of prisoners in this ancient rendering of the "event" would choose it as their way of execution.
Skinning seems so awful, so unthinkable that it's logical that a man like murderer Ed Gein and his obsession with women's skin stand out. However, his victims were dead which takes the extra cruelty of the torture out of it. Some were not even murdered by him, as he became a sort of grave robber who harvested parts of dead and buried women. Still, it seems exceedingly cruel and demeaning.
As to a modern day equivalent of the Assyrian cruelty there is one instance which stands out: The live skinning of the Polish university student Katarzyna Zowada (1975–1998). She went missing on November 12, 1998, but January 6, 1999, it was known what had happened to her as her empty skin was found. It had got caught in the propeller of a tug boat.
The investigation proved that she had been skinned alive, and that her skin had been turned into a suit that had been worn by the murderer for some time. Many experts - also from FBI - came to Poland to try to solve the case, but it took 19 years to make an arrest. Before that there had been a suspect who had been seen in a mask made of his murdered father's facial skin. He was charged with murdering his father, and many thought that he had also killed Katarzyna, but there was no evidence. Anyway, he was sentenced to jail, but the Katarzyna-case went cold until 2012.
Nineteen years after the murder (and torture) of Katarzyna, the by then 52-year old Robert Janczewski was arrested. He knew her and had a history of harrassing women and he also had had a job in a dissecting lab where he dealt with human corpses.
What made him do what he did? Your guess is as good as mine, as he didn't tell WHY .... I for one would also like to know WHY The Court of Appeal found him NOT guilty on 31st October 2024 thus turning this gruesome case into something VERY confusing. (I suppose it's easier for Poles to find more about the case than for anyone outside of Poland ....)
https://allthatsinteresting.com/flaying
Wikipedia