Question: ***SPOILER WARNING*** I don't understanding the ending to this film. What was Mandy's reason for killing people? Is this a flawed character motivation, or did I miss something?
Answer: It's likely that Mandy developed a taste for murder subsequent to the Dylan incident, in which she evidently was more complicit than would seem at first glance.
Question: At first, was Mandy serious about committing suicide with Emmett, or did she want him to die and be solely blamed for the murders?
Answer: The way I look at it is Mandy was all for suicide with Emmett but then once she met Garth all of that changed, and she wanted to be with him. It was at this point that Emmett became expendable if you will and had to die. He became the scapegoat/sacrificial lamb. This is just my opinion.
Answer: The reason for Mandy and Emmett killing off the characters is pretty much left open for interpretation, but it seems the reason they killed them was because before Mandy became "hot over the summer" (as Dylan says at the beginning), Emmett and Mandy were treated like outcasts, and after Dylan's death, Emmett probably took a lot of the blame. It's possible that Emmett and Mandy were tired of how the popular crowd had treated them before. At the end, they made a pact to kill themselves. But after finding out that Emmett is just like the others, Mandy backs out and decides not to, but Emmett doesn't take it very well and decides to kill her too. Mandy fights him off, and she saves Garth, who seems to be the only one at the ranch who saw her as a human being and treated her with respect. So any of these reasons may have been motivation (although their actions are extreme), but overall there seems to be no obvious reason.
Hamster ★