NASA got astronauts killed during Apollo, for some reason people forget about that or think it doesn't count because they weren't flying when it happened. After that they pumped the brakes and reevaluated their approaches, but the whole program remained extremely risky.

NASA was also far better funded back then and didn’t have to fight congresspeople and the aerospace giants lobbying them. Things move a lot more quickly when money isn’t a concern and you’re not having to scatter R&D and manufacturing across the four corners of the earth to get congress on board with you.