"I had committed myself to doing it when I sent for the rifle. A sahib has got to act like a sahib; he has got to appear resolute, to know his own mind and do definite things. To come all that way, rifle in hand, with two thousand people marching at my heels, and then to trail feebly away, having done nothing--no, that was impossible. The crowd would laugh at me. And my whole life, every white man's life in the East, was one long struggle not to be laughed at."
The dominant message of this passage is that a white man has to be courageous and should have a strong will power to take action when circumstances demand it. Not taking action under these circumstances is not an option.
The author uses metaphor to convey the dominant message regarding the trait of a white leader. This is evident in the statement " A white sahib got to act like a sahib: he has got to appear resolute, to know his own mind and do definite things.". In addition, the author uses persuasive writing to appeal to the readers' sense of morality.