Sure, but people are ejected in non rollover accidents too.
Yes.
School buses don’t have seat belts for the same reason you don’t require drivers to wear crash helmets; they just aren’t necessary and would create more trouble than they’d be worth. School buses are huge, lumbering things with seat layouts designed to prevent severe injuries if they crash. They are extremely safe the way they are.
And they’re also driven by professionals: That makes a difference, too.
On point, though, almost all properly-designed safety features can sometimes cause death or injury, and if a safety feature does not occasionally cause death or injury, it’s probably not properly designed.
Let’s look at the question of how easily a seat belt buckle releases, for instance: Make it too easy to release, and they’ll get released sometimes when they’re not supposed to, sending passengers through the windshield. The harder you make them to release, the less of that you’ll have. On the other hand, make it too hard to release, and you’ll sometimes get a passenger trapped in a burning, sinking, or otherwise dangerous car, who can’t release it to get out. The easier you make them to release, the less of that you’ll have.
You want to minimize the total amount of deaths, from both kinds of accidents. And you do that by finding where the derivative is zero. That is to say, if a seat belt is properly designed, with just the right amount of difficulty to release it: If you start from that point and make it a very small amount easier to release, then the increased deaths from being thrown will almost exactly balance out the decreased deaths from being trapped, and vice versa.
But this means that, at that point, it must be possible to decrease the number of deaths from being trapped. Which means that number will be nonzero. In other words, a properly-designed seat belt will result in some deaths from people being trapped in the car.
Not sure about your state, but here the school bus drivers don’t need any more qualifications than a CDL.
Which is still a greater hurdle than most drivers have to clear.
Wait, you’re not from America if I’m not mistaken? And you’re linking to a PSA? It’s a trap!
Zombies definitely don’t wear seatbelts or normally ride in cars.
They prefer…
Wait for it…
Traaaains.
If I had not been wearing a seatbelt when I was in a major smash in 1999, I’d now be posting as a zombie.
Go stand in the corner and don’t come out until you’re told
“Plaaaaaaaanes” would also have been acceptable.
Only if there’s a treadmill around. 
Speaking of zombies, do you know what vegetarian zombies eat?
Plantaaaaains?
I think people who claim that seat belts kill people are trying to reach for some evidence in order to be proudly contrary or defiant of conventional practice. They don’t like wearing seat belts, but that’s not enough; they have to find some justifiable sounding reason.
\
Do we *really *need a comment like this every time someone comments on a old thread?
Yes.
Next question?
New Hampshire doesn’t require motorcyclists to wear helmets, either. And there are those in the motorcycle world who make the same kind of claims – that helmets cause neck and spine injuries, and that they’re dangerous, and that it’s safer to ride without one, etc. Same BS.
Some do. I’ve ridden in a couple.