Depends. Hard to tell. It varies. It's complicated. I know. Even so what do you THINK?People who don't know how to properly operate something or people who sell defective goods?&nb... moreDepends. Hard to tell. It varies. It's complicated. I know. Even so what do you THINK?People who don't know how to properly operate something or people who sell defective goods? Where does the fault usually lie and why?