Unless you have state run health care, in which case a law enforcing seat belt wearing (I assume that's what you meant?) could save everyone money.

Unless it decreases short-term fatalities.

Hello! Sorry I'm a bit confused by your reply, do you mean if it ONLY decreases short term ones and not long term?

I just mean there will be additional costs to the state if it means more people survive car crashes and therefore need medical care. But those costs might be outweighed if longer-term survivors tend to have less severe injuries.

If you don't wear a seatbelt and are in an accident you are much more likely to hurt others than if you do wear a seatbelt.

Citation needed

I agree. Just relaying what I believe the common logic is for supporters of such bans.