“There is going to be more of a push to have more cameras on the streets, and it will be difficult to resist that push,” said Neil Richards, a privacy advocate and law professor at Washington University in St. Louis. He authored a Harvard Law Review paper last month titled “The Dangers of Surveillance,” where he wrote that the amount of observation these days “should give us pause.”…

“I don’t know any civil libertarian who is seriously arguing that cameras are not valuable in these high-risk events,” said Jonathan Turley, a George Washington University law professor. “But even police states can’t deter all attacks. So that’s the kind of dialogue we need but that won’t occur.”…

Former New York Mayor Rudy Giuliani, who was in England during the 2005 London subway attacks, marveled to Bloomberg News on Friday about the city’s vast network of cameras and its subsequent ability to name suspects in hours. London has “a much more efficient system than even they have in New York today,” he said…

“The only way to use these cameras to prevent crime is to have blanket surveillance, to have someone monitoring every intersection and nook and cranny, and that’s where we have problems,” said Hanni Fakhoury, an attorney with the Electronic Frontier Foundation.