Fact Snacks!

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Anyone can become a troll. Studies show most Internet trolls are otherwise reasonable people who’ve never trolled before. If you’re already in a bad mood when you stumble upon a troll post, you’re twice as likely to turn into a troll yourself, regardless of your history of online behavior.

Basically, one person not controlling their cranky can spark a vicious cycle of creating new trolls, who then create even more trolls, who, in turn, continue to multiply like bunnies.

(Source, Source 2)