The thing is, the lower back gets a lot of work already, from squats and rows for example. If more direct work is needed i think it's better to stick with hyperextensions or high rep rack pulls or DLs.
It's true that there doesn't seem to be a lot of injuries from them, but on the other hand i'm not sure that most pros actually do them regularly, especially heavy. Schwarzenegger for example, i can remember either one or no pics of him deadlifting, same with some of the other names. You've got guys like Coleman who seems almost indestructible, but then there are others like Dillet, Wheeler, etc. where i can't remember ever seeing do deadlifts.
Whatever the exercise, the majority of guys learn to avoid extremely heavy exercises later in their careers. Levrone's pec tear a case in point.