It's not possible to be world class in safety performance unless your organization manages safety as a whole system - not in pieces. A piecemeal approach has different strategies competing with each other for mindshare and resources. Some people push behavioral safety, some push ergonomic design, and so on.
It's not an easy chore to help a management team to take on a systems-thinking approach to safety leadership. Typically, the management team has limited time and the organization has limited resources. People ask themselves, "What one or two things am I willing to commit to?"