Leaders build culture. In any organization or group, the leader sets the tone or creates its culture. It’s up to you to decide what direction the organization should take.
As a leader, I believe its important for them to set the culture (guidelines, best practices and values) of the organization. The leader should set the right values of the company and share it with everyone. Values will become the guiding compass when the team members have to make decisions (be it expected or unexpected). If the organization’s values are not created or not shared with everyone, then the team member(s) will make decisions on what they see fit (which may or may not be what the organization would see fit). Thus, create simple values, share it and evolve with it.