In 95 localization was scarce. Also, the partial "inst" would have matched "install" translated to several languages (about 15 by my quick count, could be more).
In addition to all the sensible reasons others have pointed out, if you crash at a high enough speed without a seatbelt you become a projectile. If you are in the back seat when this happens, you are most certainly a danger to those in the front seats.
If the seatbelt saves your life from an accident in which you were at fault, it is easier to prosecute and extract compensation from the living than from the dead.
In the incident case, it's a post-mortem on the incident. The incident itself is (hopefully) resolved and can now be dissected to learn about what went wrong and how things can improve in the future.
That's what a post-mortem implies to me in the tech industry. A thing happened, it's over now, here are the lessons we learned to take into the future.