I'm not sure what point you're trying to make? My comment (in support of NASA) was that an isolated test failure shouldn't be looked upon as a failure of their

I'm not sure what point you're trying to make? My comment (in support of NASA) was that an isolated test failure shouldn't be looked upon as a failure of their entire programme. Instead it's actually a signal of progress being made (however slow that progress may be). There were plenty of isolated testing failures like this (some much worse) leading up to the moon landing.