brucie,

If there were several thousand contagious people who, if let loose in the general population, would cause the death of hundreds of thousands, would YOU want the exact location and details of the place known to the entire world, like the terrorists who would have exposed them in the first place?

The fact that the general location is know, but details are not is in accordance with the ongoing ( ie, has been in place for longer than most of us have been alive) guidelines for secure facilities.