Basic incompetence + complete inhumanity + a completely corrupt political system that can be purchased by corporate interest at the expense of the common folk.
In my country (and most others outside of the US I'm sure (even China does employment law better the the US https://www.chinalawblog.com/2017/02/china-employee-terminat...) ) there's legal precedent and legislation to prevent employers from firing people without sufficient reasons and also to penalize employers who break a promise of employment.
The USA however is too corrupt to care for its citizens (HN usually DEMANDS the 'sauce' so here's the 'sauce' https://www.cambridge.org/core/journals/perspectives-on-poli....