Disagree there MEL_Traveller. Let’s take this out of the aviation environment for a second.
Both my cars have in the instruction manual that I need to wear my seatbelt on every trip. Now I don’t know about others, but I don’t need to be reminded every few hours that I need to be wearing my seatbelt. It’s one of those things I have been told, and thus just do.
Now in the event of a car crash, if I’m injured, is the manufacturer at fault? Let’s say I was injured because I chose not to wear a seatbelt, but had I done so I’d have been fine, how can the manufacturer be blamed for that one?
Now let’s say the root cause of the accident was a manufacturing fault in the brakes, surely there is some liability from the car manufacturer, however since they did provide a safety device which I chose not to wear, are they still fully liable for my injuries, even though they provided a device which would help reduce or avoid those injuries had I been using all the safety equipment in line with the manufacturers instructions?
Now as for “it was only 3 minutes” example where you said you would not put your seatbelt on for three minutes if you where in the asile seat and the person in the window seat had gotten up to use the facilities. Well lets say for example you where cutting through a hard hat area on a building site. You figured you wouldn’t wear a hard hat as you where only cutting through quickly, it’s not like you where actually doing any work there. What if something then dropped on your head and injured you as a result? Do you think work cover would simply say “Oh that’s ok, he was only cutting through the area, it’s not like he was working there” or do you think you would be blasted by the for failing to use appropriate safety equipment whilst in an area where that safety equipment is required, regardless of the overall length of time you where there.
In terms of liability, in light of the two examples above, I can easily understand someone suing Airbus if they where seated with a seatbelt on, or where walking around the cabin, which is permitted by Airbus and where injured as a result. However I can not see how someone can sue a company if they failed to use all the safety devices which that company provided and told them they must use.