Do Thais just not like them?
Are they averse to wearing them?
Does putting your seat belt on in Thailand as a passenger make the driver lose face by insinuating that he/she may have an accident, and therefore isn't capable enough behind the wheel?
I've even heard stories of Thais cutting the seat belt buckles off in a new car as they believe that something supernatural will protect them anyway, so why bother?...
I also know plenty of Thais who never wear their seat belts, even when driving home drunk...
The Don.