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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Unintended consequences | 3/5 | https://en.wikipedia.org/wiki/Unintended_consequences | reference | science, encyclopedia | 2026-05-05T07:13:20.047109+00:00 | kb-cron |
=== Unexpected drawbacks === The implementation of a profanity filter by AOL in 1996 had the unintended consequence of blocking residents of Scunthorpe, North Lincolnshire, England, from creating accounts because of a false positive. The accidental censorship of innocent language, known as the Scunthorpe problem, has been repeated and widely documented. In 1990, the Australian state of Victoria made safety helmets mandatory for all bicycle riders. While there was a reduction in the number of head injuries, there was also an unintended reduction in the number of juvenile cyclists—fewer cyclists obviously leads to fewer injuries, all else being equal. The risk of death and serious injury per cyclist seems to have increased, possibly because of risk compensation. Research by Vulcan et al. found that the reduction in juvenile cyclists was because the youths considered wearing a bicycle helmet unfashionable. A health-benefit model developed at Macquarie University in Sydney suggests that, while helmet use reduces "the risk of head or brain injury by approximately two-thirds or more", the decrease in exercise caused by reduced cycling as a result of helmet laws is counterproductive in terms of net health. Prohibition in the 1920s United States, originally enacted to suppress the alcohol trade, drove many small-time alcohol suppliers out of business and consolidated the hold of large-scale organized crime over the illegal alcohol industry. Since alcohol was still popular, criminal organisations producing alcohol were well-funded and hence also increased their other activities. Similarly, the war on drugs, intended to suppress the illegal drug trade, instead increased the power and profitability of drug cartels who became the primary source of the products. In CIA jargon, "blowback" describes the unintended, undesirable consequences of covert operations, such as the funding of the Afghan Mujahideen and the destabilization of Afghanistan contributing to the rise of the Taliban and Al-Qaeda. The introduction of exotic animals and plants for food, for decorative purposes, or to control unwanted species often leads to more harm than good done by the introduced species.
The introduction of rabbits in Australia and New Zealand for food was followed by an explosive growth in the rabbit population; rabbits have become a major feral pest in these countries. Cane toads, introduced into Australia to control canefield pests, were unsuccessful and have become a major pest in their own right. Kudzu, introduced to the US as an ornamental plant in 1876 and later used to prevent erosion in earthworks, has become a major problem in the Southeastern United States. Kudzu has displaced native plants and has effectively taken over significant portions of land. The protection of the steel industry in the United States reduced production of steel in the United States, increased costs to users, and increased unemployment in associated industries.
=== Perverse results ===