Safety comes at a cost. If you want to makes planes ultimately safe, you would not allow them to fly, period. Just like NASA has now an objective of "safe flights" and basically does not send humans in space anymore because they can't guarantee zero fatality.
Safety is not a binary variable: it's a trade-off vs economical factors and the cost of each ticket. Since some people have to fly anyway, this means decreased spending in other areas of the economy.