It's a common phrase that doesn't always imply violence. A football coach also tells the players to "fight like hell" what do you think he means by that?
It is quaint how everyone ignores everything else he said.
Is politics a form of ritualized violence like football is? The purpose of sports is to channel aggressive behavior into a safe outlet, sport which is underpinned and made safe by a constant reminder that sport can only be sport so long as the concept of good sportsmanship is maintained. The fact that it is a ritualized form of violence, however, tells you why sporting events often spill over into violence especially where the supporting culture for which it is an outlet for aggression, a country like England, for example, is wont, by systemic design, to produce massive amounts of it.
But the purpose of a democratic society is to insure that each person in that society is has an equal vote so as to reflect majority rule. But because, here too, the society produces competitive hatred of the other, political parties are stand in for teams, the rules of conduct and equality of voting, for the losing party, are seen as victory for evil and the product of sin. And the greater the level of aggression that society produces the greater the desire to drift intro authoritarian rule among losers becomes.
To the victor belongs the spoils, says every self entitled ego to itself, says every person who imagines him or her self to be the exponent of The Good. Competition breeds hatred and fear and the will for power and control. The greater the emotional damage done to children the less they will aspire to the obvious benefits of selfless ideals and the more they will think only of themselves.