Useful to who? There are lies, damn lies, and statistics. Why would I want to give a white supremecist, liberal crazy person, black panther, or someone else with some other axe to grind fuel for their agenda?
My agenda is to claim that I'm a smarty-pants with a rapist-like wit, and that's it. Anything past that, in terms of data gathering, conclusions of groups, etc, is not my interest. If the quiz had 'Decline to specify' as an option, they could leave those results out of their data gathering, but they didn't, so I used the closest available.