Smart Heart
This was something the writers of MLP should’ve touched on in the comics. Also, Discord is probably even worse than all three of them, since he used all three as tools to force them to attack Twilight and, by extension, Equestria, knowing full well they would lose. And when they did lose, he took it upon himself to dispose of them by turning them to stone. Who would think that would be a noble thing to do? Just because they couldn’t be redeemed, it’s ok to use them and treat them like tools? I seriously hope no one has that mindset in real life.