I didn't read it as a joke. Young adults can be incredibly destructive if left to their own devices.
> The relationship between aging and criminal activity has been noted since the beginnings of criminology. For example, Adolphe Quetelet (1831/1984) found that the proportion of the population involved in crime tends to peak in adolescence or early adulthood and then decline with age. In contemporary times, the FBI’s Uniform Crime Report (UCR) arrest data (1935–1997), particularly the Crime Index (homicide, robbery, rape, aggravated assault, burglary, larceny-theft, auto theft), document the consistency of the age effect on crime.
> The relationship between aging and criminal activity has been noted since the beginnings of criminology. For example, Adolphe Quetelet (1831/1984) found that the proportion of the population involved in crime tends to peak in adolescence or early adulthood and then decline with age. In contemporary times, the FBI’s Uniform Crime Report (UCR) arrest data (1935–1997), particularly the Crime Index (homicide, robbery, rape, aggravated assault, burglary, larceny-theft, auto theft), document the consistency of the age effect on crime.
[1] https://www.sagepub.com/sites/default/files/upm-binaries/602...