Many people will not understand how engaging in a true debate could be relaxing in any sense of the word, but for me, debates offer a great distraction that keep my mind in a healthy state of exercise and contemplation. I don't have time to dwell on negative thoughts or frustrations brought on by other people whom I cannot avoid or address.
Regardless of what political views or moral codes you subscribe to, most people hold an idealized concept of how they think the world would work if everyone held the same beliefs and lived by the same rules. Some people strive to make those ideals a reality. They engage in protests. They participate in letter-writing campaigns. They attempt to teach as many people as they can about their philosophies. These can be good things that bring about positive changes in our world, and yet we often see in the media how these actions polarize people into "us v them."