why does dr.king seldom responds to critics

I think that the major element to this is that Dr. King is absolutely convinced that his arguments are the truth. He says that he has so little time to worry about criticism because he needs to worry about his movement.

Seldom do I pause to answer criticism of my work and ideas. If I sought to answer all the criticisms that cross my desk, my secretaries would have little time for anything other than such correspondence in the course of the day, and I would have no time for constructive work.