Assume 90% of the country is incapacitated in some way. That leaves 34 million still doing ok. Further, assume 2/3 are either too old or too young. That leaves 10-12 million healthy, capable adults.
Don't think that is enough to keep power, water, fuel, foodstuffs and distribution still working - even on a skeleton basis?
But no, don't get in the way of a zombie orgasm. It's so close they can (literally) feel it.
The truth is that even if a crazy high number like 50% is reached, that still leaves over 150m people capable of performing critical tasks.
How many people know the 3, 3, 30 rule? You can survive 3 minutes without oxygen, 3 days without water and 30 days without food.
So, super simple question, how are resources allocated in a national emergency?
Like I said, while the flu-bros are annoying, like anyone going through the 5 stages, they'll eventually reach reality. But what of the zombie porn addicts who actually fantasize about disaster. That's some sick stuff.
Some folks come perilously close to doing that.