A friend of mine only works chest and arms, and has been working out for around a year. We don't discuss it because it pisses me off when he says, "Meh, who needs legs?" Well the other day he said deadlifts were terrible for your back, I told him that was bull. Of course I had to scoure the site and read how the deadlift is an amazing exercise and more good stuff just so I stick it in my head some more. This is good, because I love to deadlift.
Then the other day I mentioned it and another friend of mine who has been lifting for around 15-20 years says they will kill my back and he had some deterioration and was up for a fusion before, and of course, deadlifting was what he says was the cause.
Really he is just one case in however many. I know people can hurt themselves with it if they use poor form. I'm not going to stop doing them because the case for how great they are is just too strong. But would I be wrong to dismiss my friends warning as just poor form, or one of the outlying cases?