People still like to complain about having to wear seat belts. Sure, they can be uncomfortable or leave bruises if you are in an accident; however, the alternative is far worse!
Just watch this '98 Expedition Rollover crash test video. Take a look at what happens to bodies inside a vehicle who aren't strapped in. As this car, any car for that matter, spins and flips all over the road you can see how easily a human body can fly out the window and even land in the path of the crash!