A rusty nail placed near a faithful compass, will sway it from the truth, and wreck the argosy.

A small distortion close to your instrument does more damage than a large obstacle far away. The compass still works, which is the dangerous part, and everybody aboard trusts a reading that is quietly a few degrees off until the error accumulates into somewhere nobody meant to go. What corrupts judgement is usually near and unremarkable.

Look for the rusty nail rather than the storm. A financial interest you have stopped noticing, a friendship with somebody whose approval you need, a resentment you consider settled. Ask what sits close enough to your judgement to be bending it.