Google has employees. Some of them are gay. If 15.4% of the San Francisco population identifies as GLB (http://en.wikipedia.org/wiki/LGBT_demographics_of_the_United...), we could probably assume that a significant minority of Google employees are gay.

This is an issue of direct relevance to many of those that work at Google. I think it's fine for corporations to take a stand on social issues that directly affect their employees.