I LOATHE movies like this
SPOILERS
There's no point to these. Zero character arc and zero dialogue (except pleading, mewling, screaming and sobbing). The entire plot is a bunch of psychopaths having their way with a group of weak and ineffectual people, leading to a pointless, meaningless ending.
We may as well watch wolves slaughter sheep for 90 minutes.
Of course, there will be those who insist that sadism for sadism's sake is ballsy movie-making, but it's just the same old played-out torture porn.
The other terrible, but not surprising, thing about this movie was that the entire ending relied on the tired trope of not finishing the bad guy when you have the chance. C'mon writers, that stopped being interesting about 5 minutes after it was first used... 30 years ago.