Sorry I didn't put it in better words. It is surely a bad design. Nvidia is at fault. I was just letting the people who want to buy the 40 series card know that they can rest assured that their card won't melt given they have properly inserted the connector and there's no serious bend to the cable.
GamersNexus's and Nvidia's own study has shown that it is mostly due to user error i.e. not plugging the adapter all the way in the graphics card power input.