The Circle of Safety turns colleagues into cooperators

Sinek's foundational idea is that every organization faces two categories of danger: threats from outside (competitors, markets, disruption) and dangers from inside (office politics, backstabbing, self-interest). Which category dominates depends entirely on whether people feel protected by their own leaders.

When a leader visibly extends what Sinek calls the Circle of Safety — absorbing risk, admitting fault upward, defending the team downward — people stop spending energy protecting themselves from each other. That energy gets redirected outward, against the actual competition.

When the circle doesn't exist, the opposite happens: people compete for credit, hoard information, and treat colleagues as rivals for scarce approval, because nothing above them guarantees safety. Sinek's blunt reframe: a company doesn't have a culture problem so much as a safety problem wearing a culture costume.

Takeaway: before fixing behavior, ask whether people actually feel protected by the people above them.