Google maps give up a basic road map of the park right so you know everywhere other people go. Then they show you the water plans, then the water treatment, etc. Its like a puzzle, the more pieces you put together, the easier it is to get around the security theatre and put guests in danger.
Complete hypothetical, Billy Bob is mad at Disney for pushing some values against his views and wants to punish them for it so he goes to Reedy Creek because he was told they give all information easily. He gets the information and then uses google maps to find out vulnerable locations. He realizes hey I can't do the old school way thats been done for years because of the security at monorails, why not mess with the water supply for all of WDW. So he does that, now leading to health hazards making people sick.
Yes FOIA gives people rights to information but those request must be in writing is part of the rules so you can know who is asking for information.