[devonbleak]

The US is insanely litigious and most large companies are very aware of the cost of unlawful termination litigation. That means to actually fire somebody you need cause, and that means having an airtight paper trail which takes time to generate OR having the employee do something that directly violates something you've explicitly told them in writing they can be terminated for. You're not generally dealing with stupid people, and if they're obeying the letter of the law/policy even while defiling the spirit of it you really can't do much to terminate them.

There are other things you can do to make it clear they need to move on but it's usually way easier and more efficient to just directly negotiate a severance and have them resign.