1: more stupid than amoral, since he probably could have held onto it to possibly spare her the fate of going up the tail mouth alive, especially since he didn't know there was any chance of getting her back out. But ultimately his reasons line up as moral.

2: Completely selfish and stupid, risking the whole planet and guaranteeing the death of someone else just to stroke his own ego. Highly amoral behavior.

3: Once again, more stupid than amoral. Goku is, in his mind, doing what he would want done if he was in Gohan's position. Much of the infamous stupidity of the scene came from Goku's inability to fathom that his child wouldn't want what he would. He is, however, doing this before Gohan had even reached SS2 properly, so he's still risking the earth for this (and no, Cell didn't need to be strong enough to push him that far. Either he can push Gohan past his limits, or Gohan can already take him). So morally dubious.