A bad result is not evidence that a system failed or did anything wrong. To show a problem with the system, you need to show, for example, that other systems do things differently in a way that would have avoided what happened here.
In what world is a "bad result" not recognized as a problem?
Bad things happen all the time even when it’s not the fault of any person or system.
Irrelevant to this specific context as well as your initial claim
You used evidence in the definition of evidence, or just still failed to define it.