When you really get right down to it, isn't everything subject? There isn't one societal or cultural standard that is a universal law, and by that I mean as natural as gravity itself. So to a terrorist, what they are doing is surely just, but to others it's borderline evil, if not that. Of course I'm just playing devil's advocate here, but when someone states something is subjective when most of their moral standards are subjective, idk it seems faulty. And even if it is subjective, in an extremely broad scale do anyone go against such things that societies permeate. Rape is bad nearly everywhere you go, so is murder and abuse. And I use those examples because in each there's someone getting hurt, and whether it's a social or selfish cause, humans want to protect each other from such hurt. You say that discrimination can and has been used to great success of preventing and protecting such dangers, but what about those who are "wrongly" being discriminated against? There's no justifying to a person who is nearly or completely brutalized because of how they look. I think the fact that our soldiers go and take fathers and brothers and sons away from families is "unjust" but I would get completely crapped on for feeling that way towards our protectors. And there are civilians who use the same degree of discrimination that our legal/Gov. forces do. After a bombing by a Muslim should I get my rifle and antagonize middle eastern people in my neighborhood if I live near the incident? Some would say I have "just" cause for doing so. But truly it'd only be to protect my own ass, because fear is the strongest of things. And I feel there is a difference between "discrimination" and "profiling". The prefix "dis" is never used in a positive light, that's like saying sexism can be used for good. Again, profiling is more of the correct term. There's a difference between saying "we're looking for a tan lengthy fellow with such ad such features" and singling out suspicious people that might fit such a description and saying "oh no I don't hire black people except for cleanup duties, it's such a sore to see one in the office everyday". THAT is discrimination, whether it's just or not. Having someone authorities go after people who resemble someone they're after and hassle those people would also be subjective. The fact that it has your best interest at heart shows why you'd think it's okay, unless you were someone who were being as you put in a positive light "discriminated against". Again, better term, profiling. Looking for certain attributes differ from denying others because of their attributes.