It's good you understand things. Though, I doubt anyone is advocating brutality per se, but rather they are pointing out the pretense, denial and illusions of the degenerate and oversocialized being that is modern man.
In fact, we get our "misanthropy" from mentors like Nietzsche and Scopenhauer, of which the latter estimates that 5/6 of the worlds population are complete vile rubbish, but as far as I know, Nietzsche gave no concrete estimate.
If you go out in the world where you are not sheltered, you will be anally raped if you understand not the truth about this world. So you must understand, that the anal rapist is your enemy, and he disguise as your friend(or "equal," as some says), and it be your duty to kill him before he sodomize you. He is driven by hedonism which serves no purpose, but will take your dignity when he pack together with his democratic friends, only driven by hedonistic lust and envy of the wise, who has wisdom resting in himself and resting in the nature as God created it. They hate the quiet wisdom and the unbending will and wrath because they are not able to go to the extremes of intelligence, beauty and strength themselves, but thrive and exist only in the trivial and mundane. What the important thing to learn is then, that the 5/6 part of the world must be seen as enemies because their actions are turned against us---even if it migth be impossible to fight them in the open.