2. Proving my point that it is not a victimless crime.
3. What is this lower hanging fruit? Putting on a seatbelt seems very simple.
4. No, this is not your body as a projectile hitting someone, but you being unrestrained prevents you from staying seated and so can't brake or steer effectively. This can even happen even when do not hit something, but just hydroplane or skid.
2. Victimless here matters in context of regulation. It seems reasonable to consider someone emotionally harmed is a victim, though its important to decide whether emotional harm felt by one is a direct action caused by the other. For example, if someone emotionally responds to seeing my dead body I didn't directly force that reaction on them and I wouldn't say there is direct responsibility for it.
3. We aren't talking about the act of wearing seat belts, everyone should choose to because it is easy. We're talking about regulation and government authority. Regulating sugary drinks, for example, would almost certainly be more impactful.
4. Brakes aren't the problem if the vehicle stopped quickly enough to make me a projectile.
And to be clear, I to wear a seat belt and want everyone to choose to. I just don't want a government to have the authority to require it and fine us if we don't do it.
You're "not sure how that would happen" but there are decades of studies showing exactly how it does happen, who the victims are, and what the quantified risks.
The primary risk is to other people inside the car, then side ejections. Front ejections are a footnote.
You decided only the last of those is a problem without considering the other possibilities.
When considered as a whole, the evidence is absolutely clear that set belts save lives.
It's the same story with vaccinations and other mandates. "I don't like being told what to do" turns into "Well, obviously, the real problem is..."
The people die unnecessarily in large numbers - far larger than if the measure really did cause mass harm.
Unfortunately, no :-( in crashes it's common for the person with a seatbelt to be killed by the body of the person without the seatbelt flying across inside the car like a cannonball. Bodies tend not to fly straight forward except for perfect head on collisions, and even in those cases the person sitting behind you without a seatbelt is going to kill you as they go through your seat. If you're alone in the vehicle I can maybe buy the argument that it doesn't matter, but even then there's plenty of examples of people being literally ejected out of the car and into harms way.