People used to knock out children as a social security/insurance policy for old age, or to work the farm as they aged. The rise of the welfare state(s) in urban societies removed that need.
I don't believe people keep their kids 'safer' because they think the world has become more dangerous.
It's slightly taboo, but I think people protect their kids more now because they are more precious to the parents. The average number of children per mother has plunged in the last 200 years, and investment required in them per child to get them to child-bearing capability is much higher also. Child mortality has dropped like a stone, so any harm coming to children is much less tolerable.
Parents have so much invested in their children - and so few of them to "spare" - that they get far more protection than before.
Evidence for that? I remember there was a guy who worked for google that quit because he thought an LLM was conscious and we needed to talk about its rights, but that's the only example I am aware of.
But civilisations have always forgotten things and then had to re-engineer them. We only recently recreated Roman-equivalent concrete; knowledge required to create the Saturn V rockets had to be re-engineered; we can't recreate medieval stained glass exactly, or Viking Ulfberht Swords; we would struggle to create Betamax tape today.
Many of the examples I found (as expected) relate to military or commercially sensitive technology that did not get written down (for obvious reasons).
It also reminded me when I read Thomas Thwaites' "The Toaster Project: Or a Heroic Attempt to Build a Simple Electric Appliance from Scratch", where to make a smelter from scratch he relied on a 450 year old book ("De re metallica" by Georgius Agricola), as well as a friendly Metallurgist.
We already lost the widespread ability to write assembler in an artisinal way. Now we have AI we will also be lazy about how we write individual bits of artisinal code. So what? Yes it will cost more (in time and money) when we need to re-engineer, but how much would it cost to keep alive all the knowledge and skills we might possibly need in the future?
We had better make sure we write down and preserve the recorded data though :)
Similarly, I did group therapy for a few years, and found it highly and profoundly rewarding.
It's much more structured, with a facilitator to help reduce the possibility of dangerous behaviours. It forced me to confront aspects of myself I otherwise might never have. It also (I think) gave me greater insight into what might be behind people's public faces.
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