Think about the last time you argued with someone... You didn't agree with their position on a matter. You let them know where you stood and backed it up with why you thought they didn't understand. Then they saw the error in their ways and changed their opinion, right?
Not likely. More likely is that you both left more convinced you were right.
Arguments almost never change opinions. They cement opinions we already hold.
Opinions do change. On many topics, my opinions are opposite from those I had when I was in my twenties, but they are different because of my experiences and observations. Not one was changed as a result of an argument...