The moment the author takes to discuss how Jeff came to resolve the dilemma of how to deal with German women trying to become concubines to American men.
Melissa, in a way, played a role in that solution. Not directly, not immediately. But a genuine role nonetheless. The same role that teachers — good ones, anyway, and she was truly excellent — have always played. The same role, in a different way, that parents play. Parents, uncles, aunts, grandparents — even, when you get down to it, the guy at the corner grocery who, in an idle moment, tosses off his opinion of how the world oughta be to a youngster come in to buy a soda.
Good boys, like bad ones, are shaped. The process is not perfect, and goes astray often enough. The mold is crooked, often warped, cracked — but it's still a mold.