A downside to sharing historical maps

From the SF Chron: When Google Earth added historical maps of Japan to its online collection last year, the search giant didn't expect a backlash. The finely detailed woodblock prints have been around for centuries, but they show the locations of former low-caste communities. The maps date back to the country's feudal era, when shoguns ruled and a strict caste system was in place. Some surveys have shown that such neighborhoods have lower property values than surrounding areas, and residents have been the target of racial taunts and graffiti. But the modern locations of the old villages are largely unknown to the general public, until these maps were overlain on current street maps.