It's entirely Janis's fault that Cady became a mean girl
Cady only became a mean girl because she joined the Plastics and hanging out with them enabled them to be a bad influence on her. And Cady only joined the Plastics because Janis wanted her to hang out with them as part of a plan to get revenge on Regina. The absurd, unspoken assumption of Janis's plan was that Cady could hang out with the Plastics without genuinely becoming just like them. And even after Cady stopped being a Plastic, Janis never apologized to her for causing her to become a mean girl or even expressed awareness of her responsibility for it.
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