>it's often very hard to get rid of them once hired
Every state in the US is an "at will" state, meaning a company can fire you with no reason as long as it isn't discriminatory towards a protected demographic.
I wouldn't be surprised if most of those states have laws for unfair dismissal as well. Companies develop an internal process to cover their backs for such eventualities. Running that process to the end is the costly bit.
Even with at will, the company can get into difficulty with unfair dismissal and other issues.
The few times I've seen someone fired (and fired fired not PIP or layoff) have been for clear and undeniable issues. The "your work isn't up to performance standards" without a PIP falls into the rare bucket (and more likely at the small companies than the larger ones).
Those who want someone removed are usually not the people empowered to remove someone.
Even complaining to their manager (which is often a bad move) usually wont result in the removal of that person
Every state in the US is an "at will" state, meaning a company can fire you with no reason as long as it isn't discriminatory towards a protected demographic.
https://worldpopulationreview.com/state-rankings/at-will-emp...