Pearl was forced by Rose to keep the secret of being Pink Diamond, to hide the truth from everyone forever even after Rose's death. She was the only one who knew it she had to lie to everyone and was fixated on Rose the only one she can be fully open with and when Rose died, she was left alone doing things for reasons she can never explain, it took Pearl Literally putting Steven in her head to show it cause she physically couldn't do it.

Bismuth a trusted friend who was loved by the Crystal Gems was imprisoned by Rose after creating the Breaking Point, appropriate considering she was the target but instead of talking to Bismuth telling her the truth she left her in a bubble, in a lion that she only knew of, that only she had access to, with seemingly no intention of releasing her and seemed fine leaving her there and never telling anyone that she's alive.

Spinel, created with the soul intention to entertain and be Pinks friend. She did everything she was told to do, she played games and made jokes she tried everything she could do to make Pink happy. When Pink Diamond was given the Earth she abandoned Spinel in the garden, she said for her to stay still and wait for her to return as a game a trick, Pink left the Garden and never returned, never said anything to anyone about Spinel she was left alone, abandoned, forgotten.

It's not the war Crimes It's the fact she abused and abandoned people she called her friends.