Talk:Catch and Release/@comment-4929778-20151224081708/@comment-26714951-20151224115004

You just answered your own question. Peridot was far from harmless and she posed a serious threat to Earth. Not only was she dangerous in her own right, but she was also running around, messing with the Kindergarten, which the Gems feared she would try to reactivate, and was trying to find ways to contact Homeworld, which carried the grave risk of another invasion.