Porn might prevent the next generation from being born, worst case.
You know it's possible to watch porn and have sexual relationships with other people though, right?
We've also effectively given everyone else access to information, communication and opportunities to expand their worldview that have been more profoundly transformational than even the printing press.
No, creating the internet was not a mistake, any more than any means of mass communication is a mistake because it can be misused as well as used wisely. Without the internet, global culture would be entirely controlled, centralized and limited by media conglomerates, digital rights management and distribution by physical media, and our means of mass communication limited to telephones. The same internet that grants freedom of expression to the "absolute worst elements of society" grants it to you and I as well.
The internet is just a network, but I believe the good it's done for humanity has far outweighed the ill.
Like the sexual abuse in Hollywood, for one example.
Do you really prefer the "absolute worst elements of society" to remain hidden rather than come out?
EDIT: (Apparently my HN account is rate-limited so I can't reply directly.) How about this: anyone who wants access, email me and I'll send you a link. The site is up and running. People can send the link to their friends, and it'll be a private HN-only sub-community.
Or at least invite only?
source: was a moderator for reddit r/place
For systems: queries of death, queries with highest serving latency, records with huge size compared to rest of the entries in DB, records with extremely high fan-in for your streaming pipeline, ...
For society, a tiny minority of: users who would vandalize online data sets, refugees who commit terrorism / crimes, citizens committing crimes, recipients cheating welfare programs, people avoiding taxes, ...
It is also the tail that imposes the maximum cost on your system / society.
This is not true for every case. Excessive focus on tail risks (and moral hazard,) in fact, can be absurdly costly.
OpenStreetMap wouldn't be possible without it either. :)
For OSM, humans are the strongest link, they are often the best way to fix these kinds of changes. A strong local community is the solution. OSM fixed this vandalism within 2 hours.