Stupidity isn't punishable by death. If it was, there would be a hell of a population drop.

The line is a darkly comic, hyperbolic observation about how common poor judgment is—and how society does not (and should not) treat mere foolishness as a capital offense. By imagining the absurd consequence of executing “stupidity,” the speaker underscores both the ubiquity of human error and the difference between moral culpability and incompetence. The punchline (“a hell of a population drop”) functions as social satire: it vents frustration at reckless behavior while implicitly affirming that survival and punishment are not reliably aligned with merit or intelligence. In Hamilton’s typical hard-edged, sardonic style, the quip also signals a narrator who copes with danger and exasperation through gallows humor.