A substantial group of people knew this was a problem for decades.
The New York Times has a good "I Told You So" article on just this point.
https://www.nytimes.com/2018/04/12/technology/privacy-resear...
More generally, it's quite difficult to present a problem as compelling when there are no bodies on the ground. Take a look around you at any particular piece of safety equipment, process, practice, regulation, etc., and realise that that price was paid, in blood if not souls.
An example I've recently learnt of was of oderised natural gas. That "gas" smell you know is not the smell of methane, which is, in fact, oderless, but a special oderiser, Mercaptan, which as been added to it.[1] The reason it's been added is New London School, New London, Texas. In depression-era 1937, the school found an inexpensive source of heating by way of a local "wet" gas line, related to oil production, that ran near the school.
The gas leaked. The explosion killed 295 students and teachers, and is still the deadliest school disaster in the U.S., 81 years later.
Texas, a state known for its reluctance to government regulation, required the addition of mercaptan to all gas supplies within weeks of the accident.
That's just one of many such stories you'll find in the world of industrial and engineering safety.
A significant aspect of unintended consequences is that they are non-apparent consequences. It takes time, and evidence, and quite often bodies, to make the point.
https://en.wikipedia.org/wiki/New_London_School_explosion
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Notes:
1. The scent is exceptionally notable and detectable at low levels. Mercaptans are part of the hazard warning system in mines, environments in which visual or audio signals might not be readily apparent.