In Matilda, we don't just have one meanie to contend with; we have three. The first one we meet in the book is Matilda's father, Mr. Wormwood, who treats his daughter like an irritating little bug. The second meanie, Mrs. Wormwood, is pretty harmless compared to the other two, but she's a meanie nonetheless because she totally ignores her awesome daughter. The third meanie, the Trunchbull, takes the cake. She rules Crunchem Hall with an iron fist, and completely destroys Miss Honey's life. Luckily, we've got the spectacular Matilda fighting on the side of good. With her wits and skills, she takes down these Big Bads, and we cheer her on every step of the way.
All of Matilda's pranks, even though they might put her on the naughty list, are actually a-okay because they were done to big meanies.
Matilda isn't good. Sure, she's nice, but her pranks show that she's a mischief-maker, and she shouldn't just get away with them, no matter whom the targets are.