Are you aware though that those kinds of warnings are relatively common in the Midwest? We receive those kinds of advisories at least a few dozen times a year. It would be impractical for everyone to stay home from work every time the conditions are favorable for tornado formation.
Plus, in this part of the country most people operate under the assumption that whatever building they're in at the time of a tornado warning will have an appropriate shelter. I don't know anything about this Amazon building and if they had appropriate shelters and if people had time to get there or what, but my point is more generally in this region of the country, "tornados possible today" is just not something people stay home from work for. And yes, that goes for office workers too. I've had to move to a storm shelter at my office many times due to a tornado warning during the work day.
Furthermore, there's no guarantee that anyone would have been safer at home anyway. An EF3 tornado (what this supposedly was) will absolutely obliterate homes if they are in the direct path.
(edit) Can't reply anymore, but you quoted this: "There aren't hours and days of advanced notice. Only a few minutes." and responded that there was plenty of notice of a possibility of tornados. The sentence after your quote said "You can't shut down for every thunder storm on the astronomical chance it'll turn into a tornado and head in your direction.", so it seemed to me like you were offering a rebuttal to the idea of "you can't shut down...". Sorry if I misunderstood what you were trying to say.
