Watching a murder in a movie is 10000000 times different than watching this beheading
In a movie, no matter how gory and no matter how much blood - it is all an act. No one dies in real life. It's fancy ketchup and rubber skin looking objects.
In a video like this - a human being is killed.
And? The guy doesn't die because you watched it. And he won't be saved if you don't watch it.
People watch any of this gore for the shock, the thrill factor.
Are you saying that it's better to get your "entertainment" for justified murder than from an innocent killing? I think that's is just as sick.
I prefer to get my share of "thrills" from an imagined, and well played out movie or elsewhere.