Bhagavad Gita, Chapter 16, Verse 9

Holding this view, these ruined souls of small intellect and fierce deeds, rise as the enemies of the world for its destruction.

These beliefs are named here as leading somewhere real and destructive, not staying harmless as private opinion.

Krishna traces the line from a distorted worldview straight to cruel action and real threat to others. Ideas, in this account, are shown to have genuine consequences.