Why does Sai Baba encourage vigorous debate and argumentation to test the faith of his devotees and refute other points of view?

The source material indicates the exact opposite of this premise. Sai Baba strongly advises against argumentation and debate. As stated in Chapter 2, "Where there is a mind for argumentation, there is abundance of ignorance and Maya." He further counsels, "Do not establish your own side, do not refute the other side, Do not engage in dualistic explanations. Why such useless effort?" The text suggests that such activities lead to bad thoughts, false logic, and unhappiness, and are a barrier to attaining the self-knowledge and bliss that are the true goals of hearing his stories.