I was born a b*tch. We just learned how to act and respond properly as we age. Society, manners and education dictate how, when, what to say/do/feel. But if pushed to the limits, people will go back to human nature: we are possessive, territorial and we kill for what we think is right and ours.
The same goes everyday. The world is still a jungle, after all, a war zone. Each of us is still a warrior inside. We would do all things necessary for self preservation, for survival.
So don't push me. The worst is yet to come, and I can make your life a living hell.