Preexisting issues, but also they didn't feel like they were getting along with anyone, and I'd be lying if I didn't say I thought stress from the training played a role. Not to reveal too much, but this person went blind very quickly, and the way they describe it, the change in how others acted toward them was dramatic. Also, let's be honest--the students come from a variety of backgrounds and often wind up defaulting into little 2-5 person cliques, people arrive with different attitudes and levels of skill, etc. As I said, I like the social landscape at LCB better than any other gathering of blind people I can think of (although the first time I went to that summer thing might be worth reevaluating...), but that does not mean there aren't jerks snobs and condescenders from time to time. I don't know enough specifics to say much else about what exactly led up to the incident.
I don't know what to say about how the staff handled it, other than that it was not really spoken of openly. I only heard rumors, until the student in question told everyone during either announcements or seminar. I'm a bit torn on this. On the one hand, I remember someone bringing up how someone at WSB successfully committed suicide, and how the staff acknowledged that there was a tragic death but tiptoed around the issue, and I'm still not sure how open anyone would have been at LCB had the attempt been successful. I want to think they'd've acknowledged what happened had it come to that (and I can't imagine people not asking if it was brought up), but I really can't say. On the other hand, it's a pretty personal thing, so when is it OK to talk about it?

The person who got away with a week of backpain was/is very determined to see it through. It did have a negative impact on their confidence, which is completely understandable! Yet just yesterday they were asking me for suggestions on where to do their out-of-town assignment. And I'm already giving out way too much information, but I can confidently say that this person does not like the risk one bit, and yet had determined by then that the training was worth it.
The person who needed surgery hasn't come back yet, if they plan to at all. I don't know how mobile they are, or anything; the last I heard is that the surgery went well and they were back at home recuperating, and that was months ago.
The person who broke their hip will probably come back, but their physical therapy for adjusting to the replacement is taking way longer than expected.
The person who went through the freakishly specific accident came back and graduated; they took several days to recover after being released from the hospital, but they were at their LCB apartment while doing so.
The person who's situation I'm unsure of stayed on and ultimately graduated. I think they were off the crutches or whathaveyou in the last couple weeks or so, but I could be misremembering. IIRC, they still had 3-4 months to go when I arrived.

Oh, I should add that the first person I mentioned in this post was not at all at fault. The driver sped around a corner, saw the pedestrian, hit them and kept driving as though nothing happened. Someone who knew the driver was apparently at the intersection at the same time and saw all this. Several witnesses. It'd've been an open-and-shut hit-and-run case, if they'd wanted to press charges (they did not). I'm not sure vision would have made any difference in that case.
The specific one I've stayed vague about would definitely have been avoided had the sleepshades been off. I don't know about the others.

I don't really know how to evaluate the risk. I know that traffic accidents kill lots and lots of people, but people drive anyway, because it's just too convenient. While this small sample tells me that the risk of injury for a blind person in training is much higher, it's worth noting that most wrecks involve inexperienced and distracted drivers. It's a choice between an increased risk of injury, and increased freedom to go where you want when you want. If one decides the gains aren't enough to be worth the risk, well, "live the life you want" . That could be because the person's skills are good enough that they expect they can make up the difference with less risk on their own, or it could be because they spend most of their time in places with excellent 24 hour transit services (and don't want to leave, ever), or it could be that they conclude that the risks are too high and the benefits too low regardless. Let it never be said that everyone who graduates from LCB is Matt Murdock.

Feel free to pick apart whatever you like.