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Businesses exist for one sole reason:

To Sustainably Increase Shareholder value.

That is it, everything else serves that purpose. Being socially responsible will sometimes help with the sustainable part particularly if your customers demand it.

Now as businesses are all run by Human Beings, there is no rule that says that you, as a part of that business, should not be a socially responsible, moral and honorable person. Those qualities carries into the business you are in and reflects positively on the company and thus a virtious circle continues.