Most people probably never think about it. I don't know how many times I have seen an aggressive driver yelling obscenities at someone (sometimes me), but that aggression is misplaced they are late for somewhere or just impatient. Aggression ruins a persons tranquility, it shakes the various bodily systems and the mind becomes clouded. Aggression is a term that makes me think of survival of the fittest rather than cooperation. Aggression is a selfish emotion it is always about "me." And how pointless it is to return aggression with aggression it just become endless chain of revenge. Someone had it right, do not resist evil, but return good for evil, but that takes much presence of mind.