In order for organizations to function properly and succeed, a certain level of structure is required. That structure is built upon people knowing their job and contributing to agreed upon outcomes. When people are professional with each other, and respect each other, it's easier to get things done rather than everyone operating to their own agenda, disrespecting others ideas and opinions, and being constantly rude and devious. Expectations of conduct set the tone for professionalism so the organization and it's people work together in harmony.