You are getting it wrong.
The lesson is that if A SINGLE plane would have crashed during talks about ASH, and on one of those planes there were an American. That SINGLE American would sue the existence out of Europe.
In this overly 'lawsuit' world the only solution was to halt air traffic.
Dear Buzz Gang and Crew,
I am sure what I am about to state will be no surprise to the people in this forum. It appears that the largest air travel debacle in modern history was due to human beings letting computers making decisions for them. Really!!!
According to numerous reports, the Volcanic Ash Centre in London and Eurocontrol, UK MET Office, UK Ministry of Defence and the Icelandic Meteorological Office all used computer models to determine whether the volcanic ash cloud was navigable for air travel. Instead of actually getting physical data to back up their computer models, they simply made a decision solely based on the computer information and models and shutdown the entire Western EU AirSpace for 6 days. It has recently come to light that the computer model and data used for calculating the severity of the ash cloud was flawed. All of these various government agencies and weather centers made a decision to trust their computers and models alone has led to the disruption of commerce to hundreds of companies in Europe and the halting of travel to hundreds of thousands of people throughout Europe.
Can you imagine, a few people in a room making decisions for an dozens of countries in Europe solely based on computer data that was flawed?
Anyway, here is a lesson for everyone reading this posts:
Computers are only as accurate or as intelligent as the people who program them.