Her comments about her not being perfect imply that one of my main theories might be correct, that much like the Gems the Diamonds create via Injectors, the Diamonds THEMSELVES were created to perform a specific purpose, and much like their subjects fight their own free-will and happiness just to keep the status quo. White of course being the worst, repressing herself SO much that she became an almost Borg like entity, wanting to instill full on anti-life blasts on those she seems imperfect for the sake of cohesion. She then logically projected her repressed feelings onto Blue and Yellow, who projected THEIR feelings onto Pink, who couldn't stand ANY of that so she moved out, and changed her identity to avoid her problems. Thanks to Steven though, they'll take new steps to breaking the chain of abuse, and create a better Gem-society across the cosmos.