I work in a country with strict laws around firing and while I suspect our laws are generally too strict, this is one of the big upsides in my view. It just makes for a healthier dynamic. People feel (reasonably) free to speak their mind, disagree, or stand up for themselves. Management is based more on merits and consensus than power and hierarchy.

Disclaimer: I've never worked in the US. The difference is probably not as pronounced as I imagine it to be!