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Either way, that ship is sailing to jerkass land and I wanted off.
As usual, there is a personal liberty vs. safety issue at stake here. If you don't wear a helmet/seatbelt, you are an idiot who does not understand how physics works, or why racecar drivers routinely survive terrible crashes. Should there be a law preventing it? From the way I see it, there are lots of stupid teenage drivers who think they're invincible whose lives are saved because seatbelts are compulsory. Every teenager thinks about safety last, and while not buckling your seatbelt is a dumb thing to do, nobody deserves to die for making that mistake.
There's also a completely selfish reason for other drivers to wear seatbelts: in the event of an accident/swerve, a seatbelt makes it more likely that the driver is going to remain behind the wheel to control their vehicle. Watch an interior video of a car crash without a belt: the driver might have been able to help control the car to some extent, but the second something happens, they're nowhere near the steering wheel.
Besides that, teenagers don't have much respect for the law anyway. It's not like the threat of a $25 fine is really going to be enough to make a teenager remember to wear a seatbelt, nor will it be enough of a threat if they don't want to. It's far more effective to ensure that people are properly educated as to the consequences of not wearing a seatbelt.
In the case of a crash, I really can't see the driver being in a position to control their vehicle. There may be some situations where a seatbelt would let you keep control, perhaps some swerves, but once the airbags come out your fate is mostly decided.
I have not seen anyone in this thread express doubt as to the effectiveness of seatbelts for saving lives