That's not how corporations work though. The default decision is "no" and an individual employee has no benefit from getting through all the red tape to get a "yes".
It is also about consistency. Let’s say for argument’s sake they decided to sue the creators of the emulators. If even one time Nintendo cooperated with and assisted the emulator developers, it is easy for the defense to argue that Nintendo implicitly endorsed the work and therefore why are they suing them.