Ever wondered how evil in the Mane Six began? Here's what I think:
Brandon Hoovesworth and his minions each took of them in their care, so to speak, and began corruption so as to carry on the legacy. But each have their own reasons of why they gave in. This story emphasizes that it was never their fault.

P.S. Brandon Hoovesworth belongs to Deathsia, not me... And don't tell Hazel about this.