Why does Society not want Cassia to be with Ky and what is Cassia's opinion of that?

The Official that works with Cassia tries to wake her up the ramifications of her actions. She knows about the girl's relationship with Ky and warns her off. She tries to get Cassia to realize how crazy the world would get if everyone could make their own choices, without rules. This is exactly what Cassia's grandfather wanted her to open her eyes to. There are few things she can do to really take control of her own life, but staying true to Ky is something she will definitely cling to.