So you decide, scre the airplane, a will save my life, and jump out. Only it fails to open, it was an unreliable parachite, bought by someone like you. They thought,'better a 50/50 parachite then no parachute?
So now you are plummeting to you death, thinking, that if you did not have the confidence of 'I have a parachute' you woupd have never attemped the barrel roll in the first place. And you would have done your utmost to steady the plane, and probably would succeed. And you would not waste time packing it and fuel carrying it around with you.
Your entire hypothetical is unlike the actual scenario, where this is being recommended.
Of course you have different solutions to a completely different problem — but what you haven’t addressed is why this is a bad solution to this particular problem.
The presence of a backup option affects your decision making. Human brain assumes the backup is reliable. If you install some 50/50 backup, you put more people at risk
If there's a safety mechanism that may or may not work, coming to rely on it is suicidal.
If there is no safety mechanism in the first place, you (hopefully!) never become complacent in the first place.
So it's better to either have a safety mechanism that will absolutely work every single time or nothing at all, than one that may or may not work and invite complacency.
