Tech people are arguing for accountability in a life/death scenario.
That there is no privacy in public spaces is a longstanding social/legal tradition. A cockpit is physically private for physical security reasons but the pilots in the cockpit are acting on behalf of public trust. Their social norms in that physical context are not their own to define.
If pilots want privacy they can quit and sit at home.
Just to illustrate, 5 years ago a first officer on year 2 pay would make on average 40-50k per year. In 2023 that has increased to 143k per year for all three American Airlines owned regionals (plus a 165k retention bonus). Similar for Spirit, increased to 142k standard and 145k on the Airbus. And JetBlue to 160k for the A320 and 153k for the A220.
In this market, the first airline CEO to say "well then quit and sit at home" to their union will have half their workforce walk out within months.
The law of diminishing returns very much exist, and as one of my teachers in engineering once pointed out: if you really want to use surveillance to put a dent in the crime statistics you should put it in people's living rooms and in their bedrooms.