No, not necessarily. Starlight was taken from a pony who stole cutie marks just to enact power and control over a town for no evident reason other than being evil, to someone who was given a backstory, in just the two episodes of the S5 finale. This could bring up a whole discussion as to how good or bad it was to create a seemingly sudden backstory for Starlight like that and make it be about a tantrum for a former friend of all things, but it’s there nevertheless, and people accept it.
when a character crosses what is known as the Moral Event Horizon, where they do something so evil and unforgivable that reforming them would be a huge strain on the suspension of disbelief
Starlight genuinely thought she was doing something good with her village
Also, King Sombra and the Storm King got far worse fates than they did, yet no one seems to care much about them, do they?
Honestly, seeing any of these monsters get reformed, especially after all they did in the finale, would be completely undeserved and not make a lick of sense from a story-telling perspective
However, the character was so popular with audiences that they had to give him a greater role for the rest of the series, and the only way to do that properly was to reform him…and since the only really bad things he did other than making things weird all over the place was either just implied or specifically to stop the Mane Six from turning him to stone, it wasn’t to hard to re-imagine him as this more jerkish-yet funny morally grey character than a straight up villain
If the villain trio were to be reformed, they would need at least a full season to show they were genuine about it given that they have all shown next to no redeeming qualities for the majority of the show
not every bad person can be reformed. That’s sadly true of real life too unfortunately.
so the one who f’d up by accident and legitimately tried to change for the better should be left to die, but those who actively, purposefully seeks the suffering of perhaps millions of creatures should be given a second chance. You want to give the shaft, give them all the shaft!
it can’t be solved with friendship
-Are you sorry?
-No!
-Well, you are not powerful enough for us so we will not spend our time on your reformation. Life imprisonment it is.
Discord should have been drawn and quartered so his element is permanently destroyed.
Glimmer should have been left in the Fallout universe to starve and die for trying to destroy entire multiverse.
But the trio should have been reformed.
The original MLP had more violence than this. Stop excusing your whining with “it’s supposed to be for kids”.