It's not really a question of trying to change the mind of the person you are arguing with. What is really happening in these kind of arguments, and why they can be useful, is we are taking advantage of an opportunities to test out the validity of the our own position, and identifying where this needs modifying, and exploring the arguments which can be brought against it.

That's why it's so pointless getting angry here - whether they like it or not, the people with whom we are arguing are actually assisting us. Why on earth should we be angry with people who are helping us, even whebn that may not be their intention? Do people doing weight training get angry at the weights they exert themselves to lift?