I think we largely agree about being opposed to chat control however we seem to disagree somewhat about the underlying reasoning leading us to that conclusion.
> even a small relative frequency of errors will yield an unsustainably high absolute frequncy of errors.
That depends entirely on the rate of true positives in the general population and the rate at which the test successfully catches them. If the success rate is reasonably high and the rate of true positives is within one base ten order of magnitude of the rate of false positives then regardless of volume the stream of reports would be expected to prove quite useful.
To put this in concrete terms, if 1 billion messages are scanned, there are 100 violations, 99 of those violations are successfully detected, and there are an additional 1000 false positives reported, then you've got about a 10% hit rate when examining reports. That would provide a genuinely useful starting point.
But it's not at all clear that we can expect numbers like that. Both because the scanners are likely much worse but also because criminals can't reasonably be expected to stick around on conforming platforms in the event that such measures are enacted.
Even if the reports were 100% accurate I'd still be opposed to it on ideological grounds. I don't think pervasive surveillance of that nature is compatible in the long term with a free and democratic system of government.
> Both you and they explain this by throwing numbers without context in combination with slightly inaccurate definitions.
It was my intent to provide reasoning for all the numbers I put forward. They were meant as examples.
As to definitions I wasn't going by anything formal. I tried to spell out exactly what I meant by each term. Apologies if I wasn't entirely clear about that. Regardless, the precise definitions of the terms aren't what matters here. It's the practical end result - what percentage of the alerts are false?