My idea is that the whole "Homeland Defense" thing is too cost-ineffective to be plausible. The lifetime cost of, for example, preventing each airplane-crash fatality will be the order of $100,000,000—and we could save a thousand times as many lives at the same cost by various simple public-health measures.
Conclusion: what we really need is a "Homeland Arithmetic" reorganization.
Mathematician and computer scientist
Toshiba Professor of Media Arts and Sciences; Cofounder of Artificial Intelligence Laboratory.
Author of eight books, including The Society of Mind.