BP was too. The blowout preventer was damaged in a previous accident. The Transocean contractors wished to stop and get the well under control, but they were overruled by the BP manager at the site. Is it any wonder that when you continue drilling while the blowout preventer is damaged, there's a blowout?
(It's a lot more complicated than that, but it is most certainly not a "normal accident" like the BP one: http://en.wikipedia.org/wiki/Chernobyl_disaster .)