Hindsight is not the issue. Just to reinforce what PJ2 wrote about Fukushima - warnings were plently and went as far back as the design of the original plant. They were constantly ignored through sheer laziness and attempts at cost cutting. Complacency and a risk management system based on odds also contributed. The whole system was corrupted including the regulatory authorities. When others refer to the supposed compromised nature of the BEA I smile ironically. If they knew what a compromised regulator is like they would pause before they wrote. The Japanese prime minister at the time of the disaster Naoto Kan had to order TEPCO to stay at the plant (TEPCO's plan was to withdraw all workers). The organisation was rotten and had been for years. Likewise, Air France developed a similar culture and this contributed to AF447. I do feel in a uncorrupted airline the PF would not have acted the way he did. Either he would have been sidelined or trained up to a suitable level. With over 30 UAS incidents happening before this one cannot say that we are shutting the stable door after the horse has bolted. One has to say that this is an organisational failure which could have been avoided.