Use it when providing a seemingly reasonable explanation for your actions.

Justifying Actions

It might conceal the real reasons behind someone's actions.

Masking True Motives

It's often used to avoid responsibility or criticism by offering an excuse.

It's used to describe the main support for a theory or belief.

Authors may use an event or fact as a framework to build their narrative.

In discussions, it's a starting point for critical analysis or argument.