Rikkitic:
Trying to conduct a 'scientific' debate with racists seems like a waste of time to me. Just look at the scientific debates about fluoride, vaccination, climate change, etc. No amount of science or logic is going to make any of these people think any differently. It is not about science or logic. It is about prejudice and emotion.
Also ... science should be subservient to ethics. Those ethics should reflect the consensus of the wider community - which is opposed to discrimination.
Because ethics should reflect the consensus of the wider community, they don't need to reflect the lunatic fringe - anti-vaccers, anti-flouride.
Consensus won't always be clear on ethical issues (for example the use of 1080). But it generally is.