Rule #6 - Never say you're sorry.
When Gibbs broke Rule #6 and said he was sorry to Abby in season seven, even she knew how rare it was. She not only questioned him about it, but said she gets terrified when Gibbs breaks his own rules.
If the reason for Rule #6 is that saying you're sorry is a sign of weakness, then maybe it can be a good thing to let your defenses down around the ones you love. Trust is earned, and this team has earned it time and time again.
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