The link you provide is a really bad example. Specifically it says In total, six vehicles passed the school bus while it was stopped., and Once stopped, the ADS-equipped vehicle contacted remote assistance with a prompt asking, “is this a school bus with active signals?” [...], a remote assistance agent located in Novi, Michigan, replied “No” to the prompt.
So first of all, 5 human drivers illegally passed the school bus during this specific incident, and the "autonomous" car was explicitly given the go ahead by a human, because the "autonomous" functions were uncertain how to proceed. By my counting, that's 6 bad drivers, all human.