There is an employer side to this story too. I'm an employer in a right to work state, and a couple of years back had an employee who mishandled a substantial amount of money. It threatened the financial health of the company and was a definite firing offense.
Even in a right to work state, he threatened to take us to court. We ended up giving him a severance package because it was cheaper than defending ourselves in court, even though we would have won hands down.
I know there are situations where employees get mistreated but we don't subscribe to those kinds of tactics. Most employers that I know don't. We give as much notice as we possibly can, give the employee ample time to correct the problem, give them a chance to move laterally if possible, and if all else fails we give a generous severance.
"If it ain't cocked and loaded it don't shoot." Rooster Cogburn