Yes, in most cases that's wise. But sometimes they become pesky, as when they want to wuck up the school system; and then it's valuable to understand their ways. Also, in websites like this one, where so many thousands are lurking and getting their impressions of conservatism, it's important to show that there is indeed rationality on the right. However, I quite agree that no one ever changes the mind of a creationist. But these debates aren't really for that purpose.