[soerxpso]

That's because the unannounced firedrills don't involve setting the building on fire. A "drill" equivalent would be if we all pretended the internet is down sometimes, and in some cases that still might be impossible to do without negative consequences.

[modeless]

Fire drills do involve denying access, though. We wouldn't need to bomb the datacenters but we would need to make them inaccessible.