More so, when bring in survivors, one would want several reminders to those to join their world, with such things as the DIA. Along with other things, such as the markings throughout DC....

So after the poles shit, the earthquakes come, the skies cloud over and reactor 4 along with hundreds of other sites fall making the air, water and surface toxic, and you are alive because of TPTB, you will die for them.

After the dust settles and those renew, historic sites such as DC will be a reminder of how wise their leader(s) are.

Don't worry, DIA and other sites are not for the likes of us, the are for the highly useful sheep, true followers.

The rest of us, while the years come, will work out of our fema camps, if so lucky, as slaves to those safe away. Slowly dying "for the greater good" by removing layers of dirt for seed bank farming and other suicide mission to restore what is left....