Where I come from, people did not have the habit of wearing seat belts, even though, at the time, it was proven to help in case of accidents. The media was all over it but people still not wore them. Government then decided to make it a law to wear it and those not wearing would be fined. The law was really enforced and, eventually, everyone was wearing it and it’s a no brainer today.

If not for the law and the fines, the behavior of not wearing it wouldn’t have changed or, if it did, it would take much longer.

Edit: typo