The recriminations are flying, most of them after-the-fact.

Japan societies of civil engineers, mechanical engineers, nuclear engineers, etc. who generally approved at time of construction.
Government in power at time of construction.
Government in power now.
People of Fukushima Prefecture who wanted jobs that the development would bring.
Management of TEPCO at time of construction, and now.
NOT GENERALLY REPORTED-
General Electric and Hitachi- GE designed the plants; they were built 80% Hitachi, 20% GE.
NOTE- Hitachi built the plant.
Failure to consult historical record- Originally Hitachi; later TEPCO could have made improvements. TEPCO as operator could have demanded changes be made by Hitachi.
Stockholders of TEPCO, who demanded good dividends- many thousands of individuals, investment houses including banks worldwide, insurance companies, pension funds.
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General Electric Power and Water CEO Steve Bolze defended the company's boiling water reactors, including those at the Fukushima Daiichi complex.
GE and Bolze have "assembled 1000 specialists, including retirees, at an emergency center in Wilmington, North Carolina, where GE-Hitachi is based."
The company is sending 10 truck-mounted gas turbines to help restore power at Daiichi reactors.
GE-Hitachi are shielded from liability by Japan's channeling laws, according to Omer Brown, a lawyer who is a member of the International Atomic Energy Agency's Nuclear Liability Expert Group. Japan assigns nuclear accident liability solely to the operators.

This mostly from Bloomberg, "GE $1 Billion Nuclear Unit at Risk as Nations Mull Atomic Future," March 16, 2011.