And now things are so risk averse they're having difficultly doing things in 2 decades that they managed in 8 years in the 1960s, ie, putting folk on the moon. The knee well and truly jerked to the point where NASA are barely pushing the actual boundaries of anything.
It'll be the likes of private enterprise that push crewed flight beyond low earth orbit now. Indeed, a privately funded Space X flight later this year is going to high low-earth orbit, farther out than anyone since Apollo 17, whike NASA fumble about on the ground with no operational crewed flight capacity of their own whatsoever.
The problem with NASA is they don't build their own craft, never have. They're a giant procurement agency, and we all know how efficient they are (NHS, MoD, etc), so when things do go wrong they don't have proper control. They only way they have of managing risk is to ratchet the caution up so high nothing gets done at all. Meanwhile, Space X have created the most reliable crew rated rocket in history, and now have more successful launches per year than the rest of the world put together, and then some.
It was a very interesting documentary.