This is very insensitive. Driving a car is a practical necessity for most people, and genuine accidents do happen. I don't know how you can possibly think it's

This is very insensitive. Driving a car is a practical necessity for most people, and genuine accidents do happen. I don't know how you can possibly think it's appropriate to tell somebody who is suffering through the grief of accidentally killing a child that "it IS your fault". Striving to drive less is a great thing to do for many reasons, but the vast majority of people will still be required to drive regularly. Some of those people will have genuine accidents. We don't currently live in a world where it is possible to completely prevent traffic accidents (which, for the record, are also occasionally caused by cyclists and frequently caused by pedestrians) It is inevitable that some people will be involved in tragic accidents, and your comment does nothing to prevent that. It just makes life worse for the people in that situation