How about for a change the female bad guys get their comeuppance

Hi, you've made some interesting points but I will add a few cents to it. And yes you are right, both in life and in cinema we really do tend to look at female criminals different than to their male counterparts and no arguments from anyone could change that fact at all.

In "Sympathy for Mr Vengeance" (2002) there actually is a scene like that where a seemingly "good guy hero" ties to a chair and tortures a woman to death by electricity who is herself involved in kidnappings and organ smuggling, but I dare say I did not at all cheer or get any enjoyment out of watching her suffer her fate, even though she was a negative character and a criminal as well.

By the way, when you speak of "we as a society" - who do you mean exactly? Cause there are I believe people who just as much want women criminals and killers to be punished without much sympathy towards them - and I seem to notice you are not one of those who have that kind of sympathy either. And why is that a problem? Maybe society as such isn't AWARE that women may also do bad deeds and commit criminal offenses, even against men like here?

Cause really is there logic to it perhaps, maybe statistically, men commit far more of these violent crime than women do, and these sympathetic societies that ahve ZERO sympathy for men who commit evil deeds strangely enough don't deter them that much or stop the problem, now do they? What about throughout whole human history where women suffered and died at the hands of men for no good or just reason whatsoever?

And do you remember what happened in Martin Scorsese's "Shutter Island" (2010) after Leonardo DiCaprio kills his wife who actually murdered their children? He felt emotionally distraught after killing her and was arrested for it and had his life ruined and even felt like he couldn't live with his bad deed that he has done.

In "Eye of the Beholder" (1999) by the way, Ashley Judd's character was a female serial killer of men but the film was shown in such a way that not only you felt sorry for her, but even Ewan MacGregor's character fell in love with her and risked his life to save her many times from arrest or death.

In Abel Ferrara's "Ms .45" (1981) although she suffered a horrible ordeal and even killed some bad men, the lead female character later went on a killing spree and killed several men that didn't deserve to die at all and she was a sympathetic character. And we even were meant to feel sorry for her when she gets killed at the end, and by her female "friend" to boot.

In Peter Jackson's "Heavenly Creatures" (1994), which actually DID inspire "Knock Knock" in some ways, we were actually meant to get behind and even like the two girls who later murdered their mother in cold blood without having any vengeful motives on our part. It was even based on a TRUE story to boot and the two girls, now all grown up women, are now apparently out of jail.

Similar to another film "Fun" also from 1994 that was inspired by that work where the two young girls kill a grandma for fun as well.

Its also sometimes funny and confusing how this film can be considered 'feminist' when it shows women themselves doing bad things to a man who in this case, unlike say in "Hard Candy" (2005), is innocent, cause they often talk about how women can't be bad and men are often bad and for no good reason. (Although even in "Hard Candy" (2005) it could be argued if the girl's methods are good and if she really is doing it to get rid of evil or because she is a psychopath herself who just HAPPENED to kidnap a bad guy.)

And yes, it also goes with saying that despite many films and cases in life showing traditional examples, or men being victims at hands of men in such cases, I have also seen other films where women have raped men and it was treated rather differently than it would be in traditional cases. And in many of those other pictures, the perpetrators were forgiven by their male victims just like a nun has forgiven the two young men who raped her in a church in Abel Ferrara's "Bad Lieutenant" (1992).

In the superhero action film "Super" (2010), the lead character played by Rainn Wilson was raped by Ellen Paige's character, but he not only FORGIVES her for it, but when she gets shot and killed, he gets emotionally distraught as if he lost a loved one, and took violent revenge on the thugs who killed her. Even audiences that were offended by that deed of hers towards him felt sorry for her when she got shot and killed albeit not as a revenge for that deed. I even cried MYSELF when at the end he stared at her drawing and cried.

And I still don't know how I would feel if I even quickly killed a bad woman in self defense as opposed to if I did it to a bad man, and I can actually see why people have a different sense of conscience there. Let alone, God forbid, to do it in a painful way,.

Also, I notice that mysoginy in films is often noticed and looked down upon in all forms, and that includes films that either show violence against women OR show women as negative characters like here, sometimes, like in Eli Roth's OTHER work "Hostel Part 2" (2007) even BOTH, but no one has ANY problems whatsoever with misandry and violence towards evil or even just men in films.

By the way, you gave modern examples, what about classic historical ones like Elizabeth Bathory?

But either way, I hope you get the idea why we cannot really make such a film like that, and if you ignore stuff like modern day feminism, political correctness and MPAA ratings in America, you can look at it from a point of view of tangeant and tendency of JUSTICE. And sorry I went on and on about it.

The greatest trick the Devil has ever pulled was convincing the world he didn't exist!