>> Your argument is tendentious in the way it arbitrarily takes certain fixed positions, such as the above insistence on not doing anything unless you can guarantee 100% success,
> What are you referring to?
It is rather surprising that you claim not to follow here, but here's just one example:
>> All ethical guidelines are, in some sense, arbitrary, but the one that says one should try to treat people equally is a pretty good one
> If the software has a less than 100% success rate, then it does not treat people equally.
As your quote is presented as a response to mine, the argument you are making here is that if the software has a less than 100% success rate, then trying to treat people equally is pointless.
> Again I don't know what you're referring to. What do you mean when you say "only so far as it justifies [not focusing on reducing gender/racial disparities]"?
Firstly, rewriting a quote is fraught with problems, especially when the actual words are just as easy to quote, and even more so as you had just quoted them accurately. In this case, they are "only so far as it justifies (in your view) doing nothing in the case of ethnicity, race and gender, but no further."
To give an example, you write "the objective should be to maximize the number of lives that are saved with the resources available", but your position only goes so far as to do nothing about this particular case, and has not been extended to its logical conclusion, which is to redirect all expenditure on facial recognition to more cost-effective lifesaving measures.
>> You have consistently failed to show any real-world evidence for your position.
> I've already addressed this argument. Repeating myself:...
Repeating yourself does not somehow nullify my response to its first appearance, which was to point out that there is good evidence for bias in the case of ethnicity, race and gender, but we are seeing no evidence whatsoever for the sort of confounding problems that you make up in your so-called "thought experiment". Your claim that you don't need to show evidence, because you have an argument in principle, leaves your position wide open to the criticisms of being unrealistic and pedantic.
> Prioritizing the error rate of one subset of the whole will be less efficient at reducing the total error rate.
Given the frequency that the law of diminishing returns is a factor, that is not nearly the given you think it is.
Let's consider some examples of how your point of view would play out. For example, there was recent fatal crash that revealed a corner case in Tesla's vision system, and other crashes that have revealed problems with Boeing's MCAS system. By your argument, it would necessarily be counterproductive to do anything that attempted to mitigate either of these issues specifically. I say 'necessarily' because if it were a contingent matter, then it would be inconsistent with your claim that you don't have to show evidence for your principle being realistic.