So who's Three Finger? Well, he's a mutated cannibal from the Wrong Turn franchise (including prequels) and eats and even kills any human (and animal, if available) on sight, especially if they were unlucky enough to set foot in an isolated, forested area of Virginia. He wouldn't eat his own fellow mutants, but even that doesn't stop his bloodthirsty intentions from killing and eating humans. Also, he's almost virtually invincible, being able to survive just about anything, really (up until his official death in Wrong Turn 3). That shows that he wasn't just a deformed human, he was a near-unstoppable monster beyond belief.
To start off, Three Finger shows absolutely NO sympathy whatsoever. Even if his son, Three Toes, and his friends, were to be killed, it'll only drive him to sheer insanity, and it'll make him seek and kill humans even more, and relentlessly tracks them down without ever stopping no matter what. And if he were to see human children, don't count on him feeling sorry for them, he sees them as food, simple as that. And he obviously shows no regard at all.
Three Finger knows what's right and wrong, he simply doesn't care; he considers hunting and killing humans (and animals as well, if available) as his own personal leisure and even if he doesn't speak, he's borderline crazy enough to just brutally murder them and eat their corpses because why not. Those who get themselves lost in the forest are almost guaranteed to be killed in the most brutal fashion at the hands of Three Finger himself, and his clan as well. And his moral agency is made clear as well, hence why he hunts down humans and just kills and/or kidnaps them in the most brutal, gory fashion there is.
And Three Finger is nowhere being intimidated easily either, which was shown in Wrong Turn 3: Left for Dead.
Moral Event Horizon
While he's obviously a mutated cannibal, even if he WAS human before, he'd still resort to hunting down humans, even killing, torturing, and eating them, dead or alive. Sure he doesn't just abduct humans and eat them right away, he'll do the same to animals as well (if any, considering there are none). And with many abandoned cars that were found, some even had bloodstains all over them, which obviously indicates that the drivers and passengers became victims at the hands of Three Finger and his clan.
Of course, he wouldn't simply abduct humans if in a public place, which shows signs of intellect and was shown to be following orders by Maynard from Wrong Turn 5: Bloodlines; nevertheless, he takes serious gratification in abducting and eating humans, not just torturing them, if given the chance. And he'll go as far as to eat children alive as well.
Again, Three Finger is a cannibal, and a brutal, sadistic kind as well and has absolutely no redeemable qualities to show for. In the end, he's a monster who views humans as food and kills them in the most gruesome fashion ever, even torturing them while eating them alive. Even if he wasn't mutated, he'd still commit heinous crimes there is, and gets away with it very easily. And he's impossible to be intimidated and just laughs it off like a sadistic bastard he is (pardon for the swearing).
All in all, I really think Three Finger should be considered PE as such, as he has a clear moral agency, even if he was following orders in the prequels. Before you ask, yes, Three Finger can't be killed, though he's by no means invincible, as he's shown to be killed in Wrong Turn 3, but not before giving Nate a twisted, sadistic grin.