Hi Shixie,
Brother, have I thought about the N percentage of the population, too!

I don't know if N is on the uptake because of our culture (U.S.) or because being an N magnet, we see more of them, or because we are now better able to spot them. It is scary. Sometimes my fear of them is overwhelming and avoiding them isn't enough. But then I remember that if I am strong and if I find the authentic people, I'm much better off. I can run, but I can't hide, so I have to polish my shield and reflect the sun into their eyes, if I can (and if it's sunny...).
I define evil as anything or anyone who takes away or fails to recognize the humanity of people or a person or other living creatures for that matter. In other words, if a human being is seen as a "thing" or object. That perception alone takes the life energy of the other out of the picture. Nazis, terrorists, psycho criminals all fit the bill as well as some organizations, systems, etc. When you are treated like a number or cog in the wheel. I found Peck's book so validating!!
I don't expose Ns if I don't need to because you are right, they become vengeful. Why take that on if I can simply walk away and leave them to their madness?
The fact that you mention an "evil" duo caught my attention as well. There was also a similar situation at my old job. Two against one will always win because they back each other up. It's like two alpha dogs who can't decide who's going down, so they team up and fight everyone else. They get off on the power they both have together that they wouldn't have if they fought each other. And it's automatic verification of one half's convenient, self-serving version of the "truth".
As for fighting for "justice" don't do it just because it's the right thing. If doing the right thing is EXTREMELY important to you, and you can take the heat, then go for it. But think long term and how this is going to benefit YOU overall. Is it going to be expensive? Do you have an extremely strong case? etc etc. Just because you are morally correct doesn't mean you will win or you will fix the system...part of me is proud of you for having the guts to take it on whatever it is, but don't let your courage run away with your need for self-protection. Whether or not things are "fair" or "unfair", have your eyes open to all the consequences of the lawsuit and what will happen once the lawyers and judges move on to other cases...something to consider is how much power they have beyond their own little fiefdom. Who else benefits from your employer acting this way or from looking the other way? Are other employers going to look askance at you if they find out you brought a lawsuit against one of their own? I think your paranoia is serving you well if you are considering all the consequences.
Good luck to you, Seeker