Protect what has been entrusted to you.
Every security role carries a form of stewardship.
An administrator receives privileged access. An engineer receives production access. A developer receives access to source code. An employee receives access to company information.
That access exists because someone trusts the role.
Security culture becomes effective when people understand that responsibility comes with access. Reporting a suspicious email, challenging an unsafe change or protecting a credential becomes part of doing the job correctly.
Technology can restrict behaviour. It cannot create responsibility.