For most people, their job is their primary (or only) source of income. Being fired decreases (or entirely removes) their ability to afford food and shelter--things which are both necessities.
A company of any significant size, on the other hand, will be able to handle the loss of a single employee just fine.
There is a power imbalance between the two parties here and I don't think you can construct a solid argument while ignoring it.
There's a reason that SpaceX and other companies pay far more than minimum wage. It's because otherwise the employees won't take the job.
I.e. the idea that employees is powerless is not true by inspection.
People also can always start their own companies, being an employee is hardly the only option. (People who start their own companies also quickly realize that their imagined power over other people is entirely nonexistent.)
It's all different people upthread - it's a conversation rather than an argument. Also, most jurisdictions have a safety net for those who lose their jobs, so people often get to maintain similar income until they find their next job.
(Most welfare systems have plenty of woeful traps, though, and I fall on the side of 'People should not lose their jobs over a disrespectful letter', but I haven't read it.)
Keep in mind just how limited those protections are in a ton of states. FL might as well not have an unemployment program for how much that has been gutted and made almost impossible to access.
A company of any significant size, on the other hand, will be able to handle the loss of a single employee just fine.
There is a power imbalance between the two parties here and I don't think you can construct a solid argument while ignoring it.