" If scientists detect a killer asteroid shortly before it slams into Earth, should the public be informed?
One researcher, Geoffrey Sommer of the Rand Corp., a Santa Monica, California-based think tank, believes the best answer in some cases is no.
Should an alert come too late to make a difference in the outcome of a global catastrophe, Sommer suggests governments should remain silent.
“If you can’t do anything about a warning, then there is no point in issuing a warning at all,” Sommer said earlier this month at an American Association for the Advancement of Science meeting in Denver.
“If an extinction-type impact is inevitable, then ignorance for the populace is bliss,” he said."
Forget for a moment the logistics of how they could manage to keep everyone in the dark.
If they could prevent people from finding out about an extinction level impact, should they???