Poor driving

I've been going through papers from my basement and discovered a document showing that my ex-H was notified in 2008 that he would be "removed" from his job (i.e., fired) because he had just had the third of what ended up being four vehicle incidents overall during his time with this employer. He didn't tell me about the incidents and he wasn't fired in 2008; that didn't happen until approximately nine months later, when he had the fourth incident. My ex prides himself on his driving, but he has had at least seven accidents that I'm aware of, and a few speeding tickets as well. At this point, this is not my problem, but I feel guilty that I let him drive our children at all. I didn't know about most of the incidents at the time, but I wonder if I was turning a blind eye. I welcome any thoughts on this topic.