"Flight testing" implies the technology is not yet proven. Hardly surprising that accidents can happen.
The A380 went through about 2500 hours of flight testing. It wasn't enough to uncover the uncontained engine failure waiting to happen. Spaceship Two is radically new technology, in comparison.
Doubtless the "anomalies" that caused the crash will be overcome but even when the technology matures there will likely still be disasters
I agree. Nitpicking: Every single loss of life is a disaster, however I'd be hesitant to use that word. I'd venture a guess the driver who apparently lost his life would prefer the word "accident", rather than "disaster".