The first one: imprisoned in stone for eons for following his nature, fully aware of his surroundings.
The second one: trapped on the moon for a millennium, completely alone but for the evil being her mind created, unable to free herself from either one.
The third: forced to banish her very sister, control the skies, and solve everyone's problems for as long as she reigns.

Why is it only one of these is considered insane? Let's take a look at the inner workings of their mind during their low points, shall we?

Royalty has many duties, and often the most important is to their people. if something can benefit two sides, it is seen as good, but each side will usually have something behind the scenes going on.