Yes! Yes they should. I’m not sure they can be. Not with so many companies out there.
I work for a company in a location in a modest sized upper Midwest town. It is a decidedly white area. Yet, even with rather easy hiring requirements, the store is whiter than the area by a considerable margin. The GM sees fit to refuse staffing certain departments with women. At all. He’s openly used the n-word on the sales floor. He was called to the mat for that, and even with a history of bigoted activities and remarks, still has a job.
This is only an example. So yes, they should. But they don’t.