Idk about the US, but I imagine it's more similar to the EU than the press suggests....

Anyway in most of the EU, by law and by convention^ people don't get fired often. When they do, it's a part of a greater process where a department is reorganized, jobs have been made redundant or somesuch. Firing individuals for below average performance is rare. It needs to be an extreme. If it is dines, it's done as part of a performance review) evaluation process with feedback, time...

The reality is that

^The convention part is important. Regardless of laws, it's very hard to operate a business that's firing a lot. Firing someone is like exiling/outlawing them, to borrow analogies from older societies.

If you try, you'll encounter a huge pile of difficulties. Moral/culture will be one. Politics will be another.