Obviously, the speaker had a point. Some who are incarcerated do have a history of deviancy that result in a special set of misdeeds when behind bars.
In the animal world, some zoos are resorting to the use of psychotropic medications to manage abnormally ritualistic or aggressive behaviors resulting from the stress of confinement. In the nineties, a polar bear named Gus became well known for endlessly swimming in a figure eight patter in his pool habitat, sometime for 12 hours at a time, resulting in his being put on Prozac and dubbed the "bipolar bear". This and many other examples of strange "mental conditions" in confined animals are highlighted in a book by Laurel Braitman called "Animal Madness" and noted in a recent article in Slate magazine.
Next to experiencing the loss of a loved one, the stress of incarceration is without a doubt the most depressing and debilitating things humans experience.
In the not so distant future I believe we will look back and see our present overuse of incarceration as barbaric and unconscionable.
Along with being both cruel and crazy making.