Vengeance seeking behavior has more to do with establish a reputation for fearfulness, and thus establishing dominance, than enforcing societal rules. It is not surprising that men seek it more often, given their increased tendency to dominance establishing behavior. That's why it's so often disproportionate, in fact, the slobbering masses are only enthralled by vastly disproportionate reactions, specifically because they are seeking this fantasy of establishing individual reputation and dominance. A person who reacted proportionality would be a pansy, someone who seeks the good of society rather than their own personal glorification. A trial is a waste of time, because that only slows things down, and that reduces the amount of reputation to be gained. In fact, the guilt or innocence of the person in question is of little relevance because this is, again, simply a reputation establishing device. As long as it is thought they are guilty, then all is good. Other thoughts such as the possibility of reform and thus the persons future possible worth to society, or the feelings of the family of the accused, are also of no relevance. This is how vengeance differs from a system of justice, a system of justice seeks the societal good, a system of vengeance seeks the individual good. It is really a sign of our fraying, decadent society, in which no one trusts any one any more and there is no thought of us, only I, that justice is now mocked, and vengeance mindlessly glorified, woe be to those who think otherwise.