Well, if you thought you'd get a negative result (or failure of something) and then a negative result occurs, the result is still negative, it's just that your expectations were not betrayed. You may have successfully predicted the negative result, but that doesn't change the result was still negative.
Can someone explain this? It doesn't seem to really make much sense.
A different kind of example: I once owned (or my wife did...) a food processor, which if you weren't around back then, is cannister with a motorized blade. A part that connected the motor shaft to the blade broke. I took it to the place with the repair parts (this was before the internet), and was told this part frequently failed. I asked why they didn't make it stronger. The reply: if it was too strong to fail, then when you were chopping something that was too hard for the processor, either the motor would burn out, which would be expensive to fix, or the blades would snap, which could be dangerous. The engineer therefore included a relatively frail part to serve as the cheap and safe failure point.