While many agents may celebrate the idea of dark-sites they have many problems that have been overlooked. I am going to eloberate some of these so people may eventually finds way to get around such issues.
1. The internet may not be up.
One agent created a dark-site for a country under military invasion. Another agent put up a dark site for countries that are rioting. Here is the thing in any military op the first thing to do is to cut off the flow of information. The second is to tap the existing flow of information and utilize that edge by either attacking the rebellion or by sowing seeds of sedition. Either way your dark site is off little use.
In other cases of natural disasters there is no gurantee that the cables that connect the internet to major servers can be cut. These infostructures are not protected. Something even more feisible is the loss of power. Without power electronic access to internet is very limited thus making dark sites not even operational in the middle of the disaster.
2. The users may not be in a state to get information
In the cases of outbreak some symptoms may be debilitating causing the person to have blurry vision, lack of hand eye cordination, or other symptions that make uses of electronics harder. Thus those in most need of the information will most likely not be able to access the information.
3. Competing sources of information
Thing about the dark sites is that they are competing against more popular sources of information and government actions. When it comes to google these sites will not even come up high enough for people to even know they exist. Your site is going to be on the bottom of the pile of blog and news reports. So for your site to be effective you have to be on the top search engines. This means it is best that your site is in existence before hand and is proven to be a legitmate source of information.
I think that the intent of creating a dark site was a good idea but the fact is that there is a lot of factors against it even being operation. If you forget or unable from activating your site when it is needed then it's no good to anyone.