Clearly the backlash hasn’t been that big, otherwise they wouldn’t stand by this action. DC is out to make money, in theory, and if too few are complaining about the hiring of a bigot it won’t make a difference to their bottom line.
This is one of those issues I struggle with. I want to enjoy good content for good content’s sake, but at times its difficult to ignore the meta information about the creator. Could I enjoy a gallery show of Hitler’s paintings? If Stalin wrote really great Star Wars fan fiction, would that be palatable? Obviously this is hyperbole, Card is far from Hitler, but I’ve stopped using the services of other companies over less bigoted stances.