Bah!
The problem is that these chaps don't "do" math and when a tech-savvy person blithers about keys, the non-techy is thinking mechanical key. Mechanical locks can be re-keyed easily in the event of a key loss, and skeleton keys are ubiquitous.
The problem, in part, is that the key metaphor has been pressed into service a lock too far.
Also, we are talking a country founded in a real sense on tech innovation. The idea that "it can't be done" is foreign to the American psyche which runs with the thought that if a problem concerns technology, it can be solved if enough money and effort is available.
Talk of mathematical impossibilities cuts no ice.
Another issue is that there simply isn't enough interest in a national discussion of the issue (or indeed, any issue) in an "adult" fashion. The only way you get people invested these days is to fire 'em up emotionally over some issue. Adult debate is a non-starter.
And before anyone laughs at the dumb Yanks, let us cough and flick our eyes on the "debate" that occurred before the Brexit Referendum, for there, in general terms, is the script for backdoored security discussions Blightside.