They were expensive and crashed a couple of times, the original concept was a reusable vehicle that would make space flight cheaper, it turned out that not much could be reused. Part of this was down to a political process called pork barrelling where government funding is spread around the country to different states to get the elected representatives from those states to pass the money for the spending so those representatives can claim the jobs benefit from government spending; this is a major factor behind the O ring failure.
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