This!
Also, I doubt it will make you feel any better but my mom was recently in a similar accident (her fault) with another CAR! Best we can tell she was just thinking about other stuff while she came to a full stop, made eye contact with the other driver, and pulled out directly into said driver. All of this was corroborated by the other driver's account as well.
We just don't think of cars as loaded guns pointed directly at our neighbors... As anyone who has been around guns knows, as soon as you lose respect for the weapon someone will get hurt.