A lot of smart people being very very sloppy.
Filmmaker Adam Curtis mentioned the risks of the type of boiling water reactors cooling systems such as those in Fukushima I,[36] and claimed the risks were known since 1971[37] in a series of documentaries in the BBC in 1992 and advised that PWR type reactors should have been used.
Fukushima had been warned their seawall was insufficient to withstand a powerful tsunami, but the seawall height was not raised in response"
Still no indication of greed, sloppiness, cut-corner mentality and general incompetence?