Why indigo children are society's cancer?
Let's be honest here. We are talking about a group of individuals that attribute infantile egoism a "magical" quality. So we have both parents that should have their right to reproduce revoked and children who will become the worst kind of adults.
In the end it's like a 2 $ cake mix for the soul, instead of growing as a person just say you're a magical creature from beyond Xenu! It beats getting an actual personality.