So if there existed a hypothetical institution with the power to mete out preventive imprisonment, and which would reliably base its decisions on mathematically sound consequentialist arguments, would you be OK with it? I'm really curious how many consequentialists here would bite that bullet. (It's also an interesting question whether, and to what extent, some elements of the modern criminal justice system already operate that way in practice.)

[EDIT: To clarify a possible misunderstanding: I don't have in mind an institution that would make accurate predictions about the future behavior of individuals, but an institution that would preventively imprison large groups of people, including many who are by no means guaranteed to be future offenders, according to criteria that are accurate only statistically. (But we assume that they are accurate statistically, so that its aggregate effect is still evaluated as positive by your favored consequentialist calculus.)]

This seems to be the largest lapse of logic in the (otherwise very good) above post. Only a few paragraphs above an argument involving the reversal test, the author apparently fails to apply it in a situation where it's strikingly applicable.