The author of making an effective argument Lester Faigley jack selzer states that evidence is the biggest thing in making a great argument. Anger is the key to an argument and not an effective argument because you can potentially hurt someone's feelings by speaking out of anger. The key to an effective argument is to get the other person to see your side and not offend them. The authors say communicating is one of the most important tools.
Elijah Harkless