It's safe to assume you won't get in an accident.

You _should_ buckle your seatbelt anyway because it's low effort, high reward in the unlikely case you get in an accident.

> It's safe to assume you won't get in an accident.

If that were the case, I wouldn't need a seatbelt.

Indeed, your chances of needing a seatbelt for a particular car trip are very low but, over many trips, it becomes a safe assumption you'll be in an accident and, therefore, generally good policy to be prepared for that eventuality.