A lot of places in the US are not, in my experience, that intelligent about hiring people.

Or, say rather, the externalities of the cost of hiring are not imposed on the people choosing to fire, directly, so they can say they "improved efficiency" by firing someone, and then the people trying to find reliable labor do not experience any improvement that might have been available by migrating the person.

agreed. the "lump of labour" fallacy is a thing -- the idea that there are always more bodies and that it's trivially easy to hire, train / get up to speed, and work them.

in practice hiring and firing is expensive and often very risky. Bjorn the office worker may now be redundant and have a room temperature IQ but he's shown he'll show up on time, sober, and is liked by his coworkers enough, so throwing $5k to retrain him may be a far, far smarter investment then blowing $7k to hire a rando for another position...