If your company demographics are significantly different from general demographics, you are probably not hiring the best person for the job - probably, your hiring is skewed towards some demographic, for whatever reason (number of canidates, subtle unconcious or even open racism or sexism). If you want to have the best people for the job, you should have a strong interest figuring out if you have such a bias in your hiring and to eliminate it.
Further, diversity is healthy, especially in jobs that require some creativity. Many different people with many different approaches beats a bunch of people who all work roughly the same way.
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