J. B. Calhoun's Mouse Utopia Experiment & DN26's model of societal collapse

The ethologist John B. Calhoun coined the term “behavioral sink” to describe the collapse in behavior which resulted from overcrowding. Over a number of years, Calhoun conducted over-population experiments on Norway rats (in 1958–1962) and mice (in 1968–1972).
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Calhoun’s work became used as an animal model of societal collapse, and his study has become a touchstone of urban sociology and psychology in general.
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Calhoun himself saw the fate of the population of mice as a metaphor for the potential fate of man. He characterized the social breakdown as a “spiritual death”.

Source: https://en.wikipedia.org/wiki/Behavioral_sink

To what extent is Calhoun’s behavioral sink-driven theory of societal collapse comparable to the one found in DN26 and summarized by Ajahn Thanissaro as:

In the future, as morality continues to degenerate, human life will continue to shorten to the point were the normal life span is 10 years, with people reaching sexual maturity at five.
"Among those human beings, the ten courses of action (see AN 10.176) will have entirely disappeared…
The word ‘skillful’ will not exist, so from where will there be anyone who does what is skillful?
Those who lack the honorable qualities of motherhood, fatherhood, contemplative-hood, & brahman-hood will be the ones who receive homage…
Fierce hatred will arise, fierce malevolence, fierce rage, & murderous thoughts: mother for child, child for mother, father for child, child for father, brother for sister, sister for brother."
Ultimately, conditions will deteriorate to the point of a “sword-interval,” in which swords appear in the hands of all human beings, and they hunt one another like game.

Source: Translator’s Introduction to DN26

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