Why an ideal, specifically a social purpose, is important:

According to Moss Kanter, there are six interrelated ways that great companies use institutional logic:
A Common Purpose
A Long Term Focus
Emotional Engagement
Partnering with the Public
Innovation
Self-Organization.

A Common Purpose: “Purpose and values—not the widgets made—are at the core of an organization’s identity, and they can guide people in their efforts to find new widgets that serve society.”

Institutional Grounding: “An investment in activities and relationships that may not immediately create a direct road to business results but that reflect that values the institution stands for and how it will endure.”

Emotional Integration: A process used by t
he Shinhan Bank after its acquisition of Chohung Bank that involved holding a series of retreats and conferences intended to spread strategic and operational information and also to foster social bonding and a feeling of being “one bank”.

Emotional Engagement: Great companies go beyond ubiquitous statements of corporate values to nurture a dialogue to keep “social purpose at the forefront of everyone’s mind and ensure that employees use the organizational values as a guide for business decisions”.

Innovation: “Companies claims that they serve society become credible when leaders allocated time, talent, and resources to national or community projects without seeking immediate returns and when they encourage people from one country to serve another.”

Self-Organization: “Self-organizing communities can be a potent force for change, propelling companies in directions they might not have taken otherwise. People with no formal orders serve as explorers and entrepreneurs.”

http://www.forbes.com/sites/csr/2011/11/07/why-corporations-with-a-social-purpose-perform-better/