That's the funny part. Marx and people like him expected the smart people to be in charge of the Communist state. . .didn't exactly work out that way did it.
Look at what they represent -
1) Kindness.
2) Compassion.
3) Love
Those are not weaknesses, those are strengths. In their opposites we can see what happens when those traits are missing.
The Evil Queen transforming herself into an old hag in Snow White. To me the 'beautiful queen' we see throughout the movie is the 'disguise' and the 'old hag' is her true self.
Disney, sometime before they turned into the utter suck we know today, did two sequels to Cinderella. And in neither of those movies did the Step Mother change or reflect on her ways. She was an abuser, liar, and manipulator through and through.
Maleficent is by today standards a self entitled spoiled rotten brat in an adult's body. Instead of waiting for an explanation for why she didn't get an invitation to the celebration of Aurora's birth, she lashed out and cursed the princess and kingdom.