"I asked what the poles of the oscillation were. “It’s uh—it’s the, uh—it’s the—it’s um—it’s probably, uh—it’s probably just that it’s not that—well, the pro-seat-belt argument is that it’s safer, and the anti-seat-belt argument is that if you know that it’s not as safe you’ll be a more careful driver.” He made a left turn and fastened his seat belt. “Empirically, it’s actually the safest if you wear a seat belt and…
In general I think arguments about the Peltzman effect in transportation are not that convincing.
If they were discussing the requirement to wear seat belts by the government/the requirement to add them to cars, Thiel would have responded quite differently.
edit, grammar mistake.