The Last Bastion is under a strict lockdown because of what happened.
Considering that an entire city was not only destroyed along with most of it's citizens, and missing, this shouldn't have come as a surprise to anyone.
Nobody was prepared for what happened, neither were they expecting it to begin with.
Not even a day passed since the disappearance of City M, humanity was in a full blown panic. While the Morning Sun Federation deals with a lot of things to maintain peace and stability, there's really not much they could do in this scenario.
After all, how can one even begin explaining the disappearance of an entire city?
The authorities were frazzled by this. Even though they already determined that Revenants did this, they still can't understand how they managed to infiltrate the Last Bastion.
Wasn't it that protective dome's job to filter these things out? How come it failed?
Nobody has any explanation for it.