It is time to face the truth: Bangladesh is a country where the majority of people lack proper mentoring and experience as drivers or at least they pretend to lack them. With roads that are far from perfect, road rage a widespread feature, and speeding as well as overtaking at inappropriate and unnecessary instances extremely common, every sane man would take extra precautions. With one person being killed somewhere on the globe after every 25 seconds, the need for preventive measures is inevitable. Sure, you cannot stop the out of control driver from overtaking and speeding on a one lane road but damage prevention is still, and will always be, in your own hands, ie the seatbelt.
It is true that in certain cases the fact that your entire body has been restricted by the seatbelt and a crash can make your neck jerk forward with such an impact that it may cause neck abrasions and perhaps even fractures. Still, it is better than being thrown out of the windshield.