I think that opinions are different when talking about different age children. I would not be happy putting my 5 yr old on a bus with no seat belt. Also saying that ' in my day ' nobody wore seat belts is not a great comment. The reason that nobody wore them in those days is because people had not done any research in to car/bus safety. People died regularly from head injuries etc etc.
I think as said before it is really important to help the schools insist on buses with seatbelts and unless we pull our fingers out then it will never change and neither will safety.
Unfortunatly, having seen many results in hospitals of people and children not wearing seat belts, I know which side I am on.