They can depend on the predictability of being belittled. The Bundys are a model of negative trust. Here's how you can distinguish between positive and negative trust. Positive trust is expansive. Negative trust is restrictive.
Positive trust is open-hearted and generous.
Negative trust is self-protective and punitive. Positive trust embraces differences. Negative trust abhors them. Positive trust is largely conscious. Negative trust is largely unconscious.