Right. Making people work 10 hours a day, 7 days a week is exactly the way to avoid human error and accidents.
for jmull below: "no relevant information" He needed back surgery and I have myself had back surgery. I have first hand experience on this topic. Your comment is really out of touch.
Really, how can you possibly believe this judgement has any bearing on the situation?
You basically stating that SpaceX have to be careful about letting him work after surgery. At the same time they're totally okay overworking engineers all the time which is known to inevitably lead to human errors.
Fact that Musks' rockets work might be very well despite terrible work conditions.