Why does the time traveler make the psychologist press the lever?
he wants his visitors to believe him.
he is too afraid to press it himself.
he can tell that the psychologist wants to do it.

How does thoreau defend his approach in the second paragraph of "economy" inwalden? -he uses the word "t" because he feels it sounds more interesting-he does not use first-person point of view because his is a fictional account-he uses first-person point of view to get his readers' attention-he uses the word "t" for the sake of sincerity and honesty.