AH": If you want to assume that black customers are more likely to do a runner, then that's your choice" - not an assumption, a prediction based on observation."
"What you are not able to do is to make a blanket presumption that black customers are a risk simply because they have black skin." - again a prediction.
"If you have an issue with customers skipping, then charge everyone upfront, and that's fine." - why must all customers be penalized when the problem area is known?
"I really don't want to have to do this again, so if you don't grasp what I am saying, then we will simply have to agree to differ." - neither do I but you keep saying the same thing parrot fashion and do not even ackowlegde the counter arguments. Can you not see that this decision is purely based on statistical experience?
// Once I went to Gibraltar and the animals there very quickly become tiresome , they rip open your bags to steal food. They sell heavy canvas bags to stop that, are they/I being simianist? No, they are merely reacting to what they know will happen if you do not react. PS before you start frothing this is not a racist comparison merely an analogy that fits well. //
"It's not an analogy that fits at all, never mind well!" - it exactly fits, I take precautions based on experience.
"How can you compare the measures in place to prevent wild animals from acting on instinct which cannot be altered, and must be allowed for, with the notion of deciding that an entire ethnic group are potential criminals, and the best way to prevent them from being criminals is to make them pay up front, and allow the white criminals who skip out without paying to get away with it." - I am not assigning any behaviour beyond that predicted arithmetically.
"I believe I have explained my point well enough and often enough - if you don;t understand what Iam saying, then we must leave it there. " - you have ignored any counter argument.