> When SpaceX launches a rocket, they think it will work. When NASA launches a rocket they know it will work.

That is such an ignorant thing to say. You think Falcon 9 has had 500+ successful launches because they _think_ it will work?

The difference is that SpaceX is a private company that has the ability to iterate fast. NASA is a jobs program and Artemis/SLS a barrel of pork, simple as that.