@tfewster - "I truly believe I'm colour and gender blind"
I suggest you submit yourself to academic studies on unconscious bias, you might not have any but it's much more likely that you are just not aware that you do (the clue is the 'un' in unconscious). The results of the studies may interest you.
Most truly believe they wouldn't simply follow an order to kill an innocent person, it turns out that the vast majority actually would - https://en.wikipedia.org/wiki/Milgram_experiment
You don't know what you're capable of.