On July 19, 1989, United Airlines flight 232 crash landed in Sioux City Iowa. 112 died, but 184 survived. 52 children were aboard, 4 of whom were "lap children" who sat in an adult's lap. 11 of the children died, including one of the lap children.
While the crew was heralded as heroes for having saved so many lives, a campaign was launched to save children from the unsafe policy of allowing infants to sit in a parent's lap. The proposed solution was to require an individual seat and restrain for each child.
In a remarkably rational review, the NTSB realized that such a policy would increase the cost for families to fly, which would cause many to drive instead, a much less safe alternative.
The FAA estimates that a regulation that all children must have a seat would equate, for every one child's life saved on an aircraft, to 60 people dying in highway accidents.
The proposed policy was scrapped, because rather than saving lives, it would have cost lives.
So, to this day, in the US, children under 2 can fly without their own seat.
An alternative would have been to require airlines to provide free seats and child seats for infants, but, well, that was not going to fly, so to speak.
Running stop signs at full speed is dangerous. Rolling past the limit line at 2 mph, no so much. I expect that Tesla's voluminous data will eventually provide actual evidence on which to base safety decisions, and perhaps regulators will follow the data. One can hope...
en.wikipedia.org
(Was O'Dowd's tech used during development of the oh-so-lethal Boeing 737 Max? Both were mentioned in the same issue of an avionics journal in 2020
Link.)