> I don’t want to work at this company anymore so I quit, I just don’t feel like working here anymore

Seems ok for the employee to quit “at will” so why not for the employer?

It’s sincere, I don’t think people are thinking through what they’re asking for

You just can’t do it like that, because you woke up grumpy that particular morning

That should be fine though, that’s freedom of association, why force people to work together who don’t want to do so?

the “valid reason” is you don’t like them, why would we want to force people to work together who don’t like each other?

I do think it’s good to create a healthy culture that respects workers, but I don’t understand why being able to fire an employee is a bad thing

Imagine you’re not allowed to fire people you don’t like who you think are doing a bad job at work