Why do some people think shouting and screaming means they won the argument?

I do notice that poorly behaved indivudals tend to resort to this tactic, whether it'd be in gentle arguments or heated arguments.. they tend to scream, yell, and make unnecessary hand gestures. Is this.. something that feeds their delusion that they have indeed "won"? Versus the individual that can remain calm, and level-headed? Why do people like to shout and scream, I don't really think this gets the point across... Or people that use intimidation tactics in order to 'win'?