I think that human nature is the natural feelings, actions, and ways of thinking that are unique to humankind. I do believe that human nature is instilled in us from birth. For example when a baby is hungry crying is a way for them naturally to let the parent know they need to be fed. Or when a young kid doesn't get their way a tandrum is a way they naturally use to try to accomplish the goal of getting what they want. I do understand where your coming from. I do believe that because of morality people do have a clear distinction on right and wrong. That's what I think draws a fine line for people who I believe get a natural urge to want to fight back when presented by someone in a hostile way. I also think goodness is apart of human's nature. I think when one is kind to another its only to be kind back, but I do recognize that some people dont respond nicely to someone being nice to them. Possibly because of environmental conditions or because they were taught by other behaviors to be that way? Possibly so, and so while I do think that naturally people act and behave a certain way I do recognize that morality and environmental conditions does play a part in the way humans behave and act. I believe it's up to us to draw a line from right and wrong and to overcome behavior that's detrimental to humanity.