What does it matter how many passengers are involved?
Should we use plastic fuel tanks on the 350 or require crashworthy tanks on all aircraft no matter the size or seating?
Should passenger seats be crash tolerant on all aircraft or just those that carry ten passengers or more?
Should we have CVR's and Data Recorders on all aircraft or just large aircraft?
At some point the discussion has to focus upon what value (Dollars/Pounds Sterling/Franc's) we place on a human life.....as technological improvements cost money and those costs have to be justified.