As Home Depot continues to assess the damage caused by a security breach that gave hackers access to 56 million credit and debit cards, tech experts say large retailers should turn their attention to addressing breaches quickly instead of trying to prevent all of them. “Are we spending most of our money on trying to keep the bad guys out or trying to detect as soon as possible when the bad guys get in?” asked cyber crime expert Brian Krebs, framing the issue rhetorically.