My (apparently) unpopular MLP opinion is that the twelve-year-old should not have been turned to fucking stone. Tirek and Chrysalis were old enough to know better. They may have been able to be reformed, but perhaps some time in Stone Hell might have given them the motivation to change.
Cozy Glow was a child. She absolutely could have been reformed without jail time. It's insane to me that a bunch of grown adults were like, "Yeah, the literal God of Chaos is still kind of a dick and would be a world-ending threat if he ever decided to stop playing nice again, but he's dating Fluttershy, so he gets a pass," and then they saw a middle schooler and said, "OH FUCK STONE HER STONE HER NOW!"
No matter what Disney villain shenanigans she got up to, she was still a pre-teen at the oldest. Figure something else out, PRINCESS OF FRIENDSHIP.














