If you lose control of your vehicle, even if after the initial collision, you are more likely to hit more cars(containing other people) on the road.
implausible
adj 1: having a quality that provokes disbelief; "gave the teacher an implausible excuse" [ant: plausible] 2: highly imaginative but unlikely; "a farfetched excuse"; "an implausible explanation" [syn: farfetched]
Maybe you should rewo0rd that because the Deer example I afforded you is real and losing control of a car after initial collision is not far fetched in the least.
While you may simply disregard it, that in and of itself does make it what you claimed it to be.
Seat belts do help in many situations, that is a fact you should accept. But you are free to live in denial if you chose to about that point.