Silverpatch didn't ask to become bad, but when CometClan came and killed her kits, she lost herself. She killed innocent cats, trying to avenge her kits deaths. But she realized that it was a hopeless attempt, her kits were dead, and that couldn't be changed. Silverpatch reformed, but became a rouge. Unable to live with her clan anymore, afraid to lose herself again.
Credit to scratch-mg this is just for fun, i know the contest is over