THE twin revelations that telecom carriers have been secretly giving the National Security Agency information about Americans’ phone calls, and that the N.S.A. has been capturing e-mail and other private communications from Internet companies as part of a secret program called Prism, have not enraged most Americans. Lulled, perhaps, by the Obama administration’s claims that these “modest encroachments on privacy” were approved by Congress and by federal judges, public opinion quickly migrated from shock to “meh.”