Century-old stone "tsunami stones" dot Japan's coastline (2015)

Forgetting Historical Lessons and Risk Tradeoffs

• Several comments argue societies repeatedly forget hard‑won lessons after 2–3 generations, citing deregulation before the 2008 financial crisis and rising far‑right support in Europe.
• Others say risks are not forgotten but consciously traded off for economic or political reasons (building in fire zones, overusing groundwater).
• There is disagreement on whether recent disasters are mainly due to “ignorance” versus known but neglected risks.

Tsunami Stones and Other Physical Warnings

• Most tsunami stones are memorials (death tolls, grave markers) or general advice (“choose life over possessions”), with only one explicitly marking a safe building elevation.
• Geological markers like coral high above sea level are mentioned as very long‑term tsunami indicators, though not as precise as stones.

Fukushima and Nuclear Risk Management

• Some see Fukushima as an example of ignoring historical tsunami knowledge and building in an obviously unsafe location.
• Others stress Japan’s geography: plants must be coastal for cooling water, and no site is free from earthquakes, tsunamis, or landslides.
• Consensus in the thread: core problems were design failures, inadequate failsafes, and ignored warnings. Debate over whether blame lies more with the operator, regulators, or state ownership.

Religion and Cultural Memory

• One line of discussion compares tsunami stones to religious texts as long‑lived repositories of social lessons.
• Defenders argue scriptures encode generational wisdom and behavioral “immunity” (e.g., on family structures, fertility).
• Critics counter that useful norms have already been absorbed into secular law and culture, while religion’s persistence also reflects power, control, and outdated or harmful rules.
• There is a sharp clash over prohibitions like those on homosexuality; one view suggests they may reflect forgotten societal risks, another rejects this as unfounded speculation and harmful.

Rebuilding in Dangerous or Toxic Places

• Examples include Brazilian flood valleys, Love Canal housing, and Seattle’s Gas Works Park.
• Themes: economic pressure, lack of awareness, and willful repopulation despite visible markers (water lines, prior cleanups).

COVID-19 and Pandemic Lessons

• Strong disagreement over what COVID “taught”:
  • Some emphasize preparedness (supplies), value of masks/WFH/mRNA vaccines, improved supply chains, and community solidarity.
  • Others focus on government missteps, inconsistent messaging, perceived coercion around vaccines, and social division.
• Long subthread debates:
  • Mask mandates: one side argues they reduced spread and saved lives, including children; the other claims limited benefit and harm to children’s social and emotional development.
  • Vaccines: one side insists they were well tested, effective at reducing severity and some transmission; the other calls them rushed, insufficiently tested, and criticizes mandates.
  • Ivermectin: one commenter presents it as unfairly dismissed; others cite analyses finding no reliable benefit and describe promotion as disinformation.
• Meta‑point: people tend to extract lessons that reinforce prior beliefs; there is little shared consensus.

Generational Memory, War, and Extremism

• A recurring idea is an ~80‑year “cycle” of crisis and forgetting (e.g., 1918 flu vs. COVID, WWII vs. current politics).
• Some worry WWII lessons are fading, citing the Ukraine war and rising extremism (Nazism, hyper‑nationalism).
• Others note that, despite problems, many countries reacted relatively swiftly and mostly united against Russia, suggesting some lessons remain, though the global response beyond the West is seen as weaker.