The simpsons have made a bunch of bad stuff in a lot of episodes and im really surprised they are not in villains wiki yet, they should really reconsider adding them here.
Here are some examples
Homer
In "alone again, natura-diddily" he killed flander's wife.
In "trash of the titans" he flooded the entire city of springfield in trash forcing all the people from springfield to move to a different place.
In "treehouse of horror v" homer went on a killer rage and tried to kill his family because there was no tv or beer for him.
In "lisa's pony" lisa needed a new saxophone reed for the school talent show, homer instead of buying her one at time he went to drink at moe's, when homer went to give lisa the reed for her it was too late and when lisa started playing her performance got ruined, humiliated and dejected and it was all homer's fault.
Bart
In "postcards from the wedge" bart destroys the school by using a train in an abandoned subterraneum.
In "please homer, don't hammer 'em" when bart discovers that skinner is allergic to peanuts he starts torturing him constantly.
In "bart vs thanksgiving" he burns lisa's thanksgiving centerpiece.
In "the telltale head" bart decapitated the head of jebediah springfield's statue.
Lisa
In "lisa's rival" lisa sabotaged allison's work.
In "dude, where's my ranch" lisa lied to clara putting her life in danger.
In "my sister the sitter" lisa pushe's bart from the stairs and got his arm broken.
In "dial N for nerder" lisa trying to save martin she ends up pushing him from a platform where he felt, and she also tried to force bart to not say anything about what happened to martin.
Marge
In "bart after dark" she destroyed a burlesque house with a bulldozer, despite bart trying to work in there to compensate something he did
In "sweet and sour marge" she bans suger from springfield, when she sees that the whole town is overweighted.
In "steal this episode" marge snitched on her own husband homer pirating movies.
In "It's a Mad, Mad, Mad, Mad Marge" she ruins becky's life and even went as far as to trying to kill her.
