Heathers

Veronica initially stays with the Heathers because she values her social status and fears exclusion from the popular crowd. Though she despises their cruel pranks, she feels trapped by the need to belong and participate in their games. Her willingness to write the fake love note to Martha shows how complicit she becomes, demonstrating the pressure teenagers face to conform to toxic social hierarchies.

Earlier scenes show Veronica reluctantly going along with the Heathers' schemes while visibly uncomfortable, hinting at her internal conflict.

Heather Chandler died from drinking drain cleaner that J.D. had mixed into the punch at the party. The original plan was to make her sick as a prank, but Chandler drank the poisoned cup despite Veronica's attempts to stop her, leading to her death.

J.D. shows Veronica the drain cleaner earlier, hinting at his willingness to use extreme measures against those he despises.

J.D. and Veronica positioned Chandler's body to make her death look like suicide, and the school had no witnesses to the actual events. The mysterious circumstances and the fact that Chandler was found with a suicide note (which J.D. had written) led administrators to conclude it was self-inflicted, even posthumously elevating her status.

J.D. suggests staging the scene as a suicide right after Chandler's death, showing his quick thinking to cover their tracks.

J.D. planned to kill all the students at the school prom by pumping carbon monoxide into the venue, making it appear as a mass suicide. He had set up the system and was ready to execute this plan when Veronica confronted and stopped him.

J.D. shows fascination with suicide and discusses the 'purifying' effect of mass death throughout the film.

Martha attempted suicide because the fake love note prank destroyed her social standing and left her humiliated. Desperate to be accepted and popular like the Heathers, she saw no other way out of her loneliness and social isolation.

The fake love note prank earlier in the film directly leads to Martha's desperation and suicidal ideation.

Veronica confronted J.D. at the school while he was setting up his mass murder device. During their struggle over the gun, it went off and J.D. was killed. The film leaves ambiguous whether Veronica pulled the trigger or if it was an accidental discharge.

Their entire relationship builds toward this confrontation, with Veronica gradually realizing J.D.'s violence has gone too far.

J.D. appears to take his own life during the confrontation, though his exact motivation remains ambiguous. He may have wanted to escape the consequences of his actions, believed death was his only redemption, or simply wanted to hurt Veronica one final time by making her witness his death.

J.D. has discussed suicide idealistically throughout the film, treating death as a form of ultimate statement.

The red scrunchy represented the position of power within the Heathers. After Chandler's death, Heather Duke takes the scrunchy and wears it, symbolically claiming the role of leader and taking control of the clique.

Earlier scenes show Chandler wearing the red scrunchy as a marker of her authority over the other Heathers.

Veronica initially helped J.D. because she genuinely hated the Heathers for their cruelty and wanted them punished. She believed his victims deserved what they got. However, she gradually realized J.D.'s violence was uncontrollable and morally wrong, which led her to turn against him.

Veronica's diary entry wishing harm upon the Heathers shows her initial dark desires before she witnesses the consequences.

Veronica transforms from a passive participant in the Heathers' bullying into J.D.'s accomplice, and finally into his opposition who rejects both the Heathers' shallow cruelty and J.D.'s violent solutions. By the end, she chooses authentic friendship with Martha over popularity.

Her growing discomfort with the Heathers' actions and her bond with Martha hint at her eventual moral awakening.

Heather Duke took over because Chandler's death created a power vacuum in the Heathers. Duke immediately claimed the red scrunchy, traditionally worn by the leader, and asserted dominance over the remaining members, particularly Heather McNamara who was emotionally vulnerable.

Duke's jealousy of Chandler's power is visible throughout the film, and she quickly seizes opportunity when it arises.