Silver_lining 
"[@Ferrotter":](/878570#comment_4329790
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On the flip side, I'll say it's an equally important lesson that just because you start off on the wrong hoof doesn't mean you can't make amends down the line. Maybe Diamond Tiara's reformation serves as a lesson for girls like her that just because you're raised by a snotty, arrogant brat doesn't mean you have to be one. It might get girls who have mothers like Spoiled-~~Milk-~~ Rich to realize they can be better than that, that they can _*choose_* to be decent.
I think the greater flaw is that, before Crusaders of the Lost Mark, there wasn't much build- up to DT having _*any_* decency in her; Silver Spoon showed more hope for redemption (and I'm sure many expected her to be the "bully who spends a day with the nice kids and reforms because of it"). An occasional scene here or there would have created some anticipation for DT being reformed.
But I think the underline message of making peace with a former enemy is a beautiful one in its own right. Yes, you must take care to protect yourself from the truly bad people of the world, but not every instance of adversity equals a complete, irredeemable monster. DT represented the CMC's greatest challenge, and by making peace with her, by helping her make peace with herself, they moved past adversity and realized their true calling: helping ponies understand themselves. Meanwhile DT opened her heart to friendship, stepped out of her mother's shadow, and found herself in a happier place because of it. No more wasting time being a bully; now she's free to grow into a mare of her own making, just as her new friends are doing.
On the flip side, I'll say it's an equally important lesson that just because you start off on the wrong hoof doesn't mean you can't make amends down the line. Maybe Diamond Tiara's reformation serves as a lesson for girls like her that just because you're raised by a snotty, arrogant brat doesn't mean you have to be one. It might get girls who have mothers like Spoiled
I think the greater flaw is that, before Crusaders of the Lost Mark, there wasn't much build
But I think the underline message of making peace with a former enemy is a beautiful one in its own right. Yes, you must take care to protect yourself from the truly bad people of the world, but not every instance of adversity equals a complete, irredeemable monster. DT represented the CMC's greatest challenge, and by making peace with her, by helping her make peace with herself, they moved past adversity and realized their true calling: helping ponies understand themselves. Meanwhile DT opened her heart to friendship, stepped out of her mother's shadow, and found herself in a happier place because of it. No more wasting time being a bully; now she's free to grow into a mare of her own making, just as her new friends are doing.