For example, consider a car accident. I'd claim that it is reasonable to assume that many adults have driven a motor vehicle for at least 7,000 hours. During that period, is it reasonable to assume that a human would not make a single error a judgement, or not have a single lapse of concentration? I would argue that *every* driver, no matter how good at driving they may be, would make at least one error during 7,000 hours of driving. Ideally you would not make a single error, but that's just not feasible.
When such an error coincides with bad luck (wrong place, wrong time, bad conditions), then that error manifests as a motor vehicle accident.
So essentially, what we have is a lapse of concentration (which every human makes) vs. malicious intent. There's a huge difference between the two.