I can agree with you in many cases. But for convicting someone due to negligence, they have to, by definition, have conducted themselves in a way that competent

I can agree with you in many cases. But for convicting someone due to negligence, they have to, by definition, have conducted themselves in a way that competent people engaged in that activity wouldn't usually. If all drivers drive a certain way, even if it's dangerous, then you're not negligent by the standards of the law for driving that same way.