Outside of special provisions like the ones JohnnyO named, every level of court will find you negligent if a passenger is injured in a wreck and you removed the airbag for their seat. Negligence is a universal concept in both precedent and the common law which underlies our laws.
The key to the heart surgery is the ST has a back seat so there is an option to removing the air bag. You will notice that vehicles with no back seat, almost always have a key to disable the bag. The short people would be the driver becasue height has no bearing on the passenger. Short people are injured by drivrs bags because they have to sit so close to the wheel to reach the pedals. They cannot sue themselves for negligence if they are injured by their removal of the airbag. The medical condition is the same theory of liability. You have no recourse if your negligent action caused your own injury, unless the manufacturer made it so easy to do that they "invite" or "entice" you to remove it. Given the scenario I presented, even I could win the case and I am not a lawyer, although I do testify as an expert witness in automotive product liability cases.
Yes, there are exceptions, just as one of our members has tint on his windshield and a doctors Rx due to sensitive eyes. There are always exceptions.