@GenericArchangel
The flaw in your argument is that not only was villain Starlight of the season 5 finale WAY more intelligent and Machiavellian then Cozy Glow or Reformed Starlight, her ideologies were the secondary motivation for her at the time of her S5 finale..
She was actively committing dangerous time terrorism and purposefully leaving them abandoned into timelines where she ruined their friendship, and did this not out of ideology, but out of overwhelming and cruel and completely evil SPITE. She was smug, she was genre savvy, she even proved she could make Fluttershy friends with her old enemies using her own ideology just to rub it in Twilight’s face that not only did she know all the weaknesses of Twilight’s brand of friendship, she could almost trick Twilight into being a hypocrite.
Their ideologies weren’t the only difference, villain Starlight’s morality was beyond sketchy even in factors not pertaining to her beliefs.
The reason Starlight reformed was because she was given the ULTIMATE denial of her own path. The time travel was used to show Starlight that her actions would not only destroy herself but everything in existence, that no matter how she retaliated against their friendship, the world would end. It was the ultimate, unfair ultimatum. And that only if she followed Twilight and set everything right, things would be OBJECTIVELY good.
Many people note that Starlight S5 and Starlight 6 and onwards are two very different characters, even with the reformation. In a sense, that’s not that far off from the truth. Literally EVERYTHING she culminated in the past one or two decades about her way of life and philosophy was simply denied by FATE AND THE ENTIRE UNIVERSE, the future herself telling her that everything she set out to do would be the worst thing in history. Your ‘self’ would be destroyed. That’s not something Cozy Glow would of gone through either with her confidence intact, and you know it.
Cozy Glow is like Diamond Tiara’s mother, she’s an easy target, as well as a Darla Dimple(Cat’s Don’t Dance) homage that we assume initially is just pure evil.
Cozy IS really good at being evil, but as all as adults with retrospect know, kids have no filter. A kid just intelligent enough to get a grasp and passion for sadism would be an absolute terror. But she’s isn’t some perpetual creature destined to do the same thing over and over again forever. She’s merely a kid with prodigy nasty streak. Especially as children, our minds grow, our minds learn when confronted with arguments better then oneself, our hearts change. Cozy was mentally prepared to reject all regular friendships with no special treatment. She is a bad egg, but she ain’t the devil. She can be outwitted, she can be emotionally perplexed. If someone far more intelligent the Cozy counseled her before just sending her to Tartarus (a very obvious difference between sending a child to Tartarus for what she did when compared to punishing a former cult leader and time terrorist with free room and board), things may have been a lot different.
People in the comments section keep on making this ridiculous assumption that she was irredeemable compared to others just because ‘she seamed that way’ and ‘only craved power instead of warped ideology”. That’s nonsense. If anything her desire for power was reflective on how naive and short sighted she was, despite being mentally more advanced for a kid her age.
Being a child DOES actually matter. Some adults in the comments see it as an excuse for Cozy to get to do whatever she wants, but I see the opposite…Cozy being a child is an excuse for Bronies to blame the actions of a child, a creature with very little experience or self reflection, with as much hate as possible, without accepting what children really are to ruin their fun. Cause like Darla Dimple, Cozy Glow IS fun to hate. I am not denying that. But that does not change my perspective. Human kids weren’t a focus in Cat’s Don’t Dance, but little fillies are a big focus in MLP.
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HOWEVER..like I said before, I am not advocating infinite patience for Cozy Glow. As adults, it is our moral responsibility to give children the chance to grow into productive member’s of society as they have underdeveloped brains. But at a certain point, the damage they cause can outweight the responsibility + effort put into reforming the kid. Equestria’s threshold for amnesty is…pretty damn high for some. On cozy’s end however, Tartarus then petrification were two incredibly high penalties.