or the famous ditching of an A320 in the Hudson river. In the latter case, when the plane hit a flock of geese, a couple of 100 ft might have made the difference between being able to reach a runway or having to ditch.
With 99% likelihood, US1549 departed with derate and assumed temperature thrust reduction. Had they not done so, they might have been able to make a runway instead of ditching - according to the above logic.
A reduction of takeoff thrust was obviously a reduction of margin.
Did anyone blame them?
Did anyone go to jail?
Of course not, since it's part of an acceptable risk. Anything that reduces our margin is most of the time a commercial compromise.
You're just being stubborn.
No, I agree about a reduction of margins reduce safety. Where we disagree is about acceptable level (those are set by rules and regulations).