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The downsides to have seat belts usage not mandatory outside of reducing deaths/injuries. A few that comes to mind:
1. Parents don't wear them -> kids don't wear them 2. Friends don't wear them -> peer pressure not to wear them 3. Accident happens -> body flies out the window (risk of hitting someone, makes a mess to clean up) 4. Accident happens, person survive but is injured and is now a cost to society
Upsides (I worked with someone who refused to wear it and told me something like that):
1. Anecdote about someone that was wearing one and got into an accident and the seat belt somehow prevented them to escape the burning car and they died 2. It's less comfortable 3. Makes me feel alive (freedom)
He would only falsely wearing it when there was suspected police presence.
Replies
To add to upsides:
4. Occasional anecdote about someone who knows someone who was in an accident while wearing seat belts, and the seat belts proceeded to slice their head off or cut the body in half or something else like that.
I assume an event like this happened more than zero times in the history of the world, but AFAIK it's too low-probability to worry about (with possible exception of kids under a certain age/height, that shouldn't be strapped in with regular belts in a standard adult configuration).
> 1. Parents don't wear them -> kids don't wear them 2. Friends don't wear them -> peer pressure not to wear them 3. Accident happens -> body flies out the window (risk of hitting someone, makes a mess to clean up) 4. Accident happens, person survive but is injured and is now a cost to society
If you are so concerned about this chain: price out the whole thing and add an appropriate tax.