The people in the industry that I know were/are trying to stop fraudsters, script kiddies, nasty people, and governments from trying to exploit weaknesses and take unauthorised control of devices and services.
The problem with that is it generally requires a central point of trust.
Sure you can allow multiple points of trust, but for the unskilled user, that means that the little lock symbol becomes unreliable (or whatever)
Without commenting on the UK governments stuff (It is probably full of shit, but then thats what lobbying does) We as technologists need to engage with wider society and understand on their terms, the worries they have.
For this particular "proposal" it strikes at the core worry of today's kids. They are sadder, more insular, more dependent on mobile comms and exposed to much nastier stuff than millennials were at the same age.
AT my school in the very late 90s, a group of 14 year old girls went to the beach and took a disposable camera. Standard photos apart from one, which was a group of them topless. One of them brought them back from the developers into school. Somehow the topless photo was stolen and passed around various classes.
It ruined her month, even though she got the photo back. I suspect it left scars longer than that.
Now imagine not being able to get that photo back. Thats the problem for todays kids. One moment of stupidity and a lifetime of consequences. (under a certain age, if they took photos or videos of other kids, that makes them liable to be on a list, for life.)
You could say "oh education" but did you listen at that age?
Whats worse now is that there are no gates on what photos can be developed by the normal person. If you took any photo that was explicit, it almost certainly wouldn't be printed (hence why there were very little dick pics from that era).
Is what the UK government proposing workable? well looking at the OSA, almost certainly not.
However unless we, as a tech community engage with society, with useable answers that are understandable to the normal person, then we are going to be crushed by the weight of "something must be done". Absolutism is not our friend here. We need to engage and choose compromises, or lose wider freedom for ever.