"Best interests" is deliberately vague. Is it in their "best interests" that you fire the CEO and call the cops because he raped an intern? Or maybe that you agree to accelerate his $40M "bonus" if he agrees to resign without saying why? Or maybe it's in their "best interests" that you pay PIs to develop evidence that the intern has a drug habit and "leak" this "shocking revelation" to the media if they go public?

You can argue almost anything meets this criterion, in some egregious scenarios a court won't buy it, but they will give you enormous leeway.