[rob_c]

For the case of this incident unfortunately yes it lies with the people stepping off the page and doing something the designer never intended.

That being said yes. Lots of lessons to be learned including, why did you build a system that allows them to do this?

Cause is easy to attribute, identifying who was irresponsible and blame less so. In this case it was caused by the operators.

[Retric]

Taking out an excessive number of control rods is something that many people have attempted including US operators. If the reactor lets you do it then that in and of itself is a massive design flaw.