ETA: Also, don't forget that the producers edit what they say as they see fit. My family gave an interview after my cousin died and the end result was that they were pleading for people to be careful for cyclists when they're driving on the road when in reality they acknowledge that it was just an accident and the truck driver couldn't have avoided him. A voiceover and a carefully asked question by the interviewer changed their sentiment entirely for the viewing public.
As I said above, I researched this last year and it's just terrible. I'm often driving in the car and can forget if DS is in the back seat or not (usually I think he's there when he's not). From memory, the basal ganglia takes over when you're doing repetitive tasks and you simply forget you haven't done something like drop your child at daycare. Your brain can insert the memory of having done it another day when you think about it so you think you've done it. In one story I read, the guy's car alarm went off several times during the day and he went to the window of his office and turned it off with the remote. That one stuck with me, I can only imagine the emotional torment.
It can happen to anyone and you are fooling yourself if you think you're immune and it could never happen to you. It's simply how our brains work. What you can do is take steps to try and prevent it. I make a point of always putting my purse/handbag in the back with DS. If I go to the shops, I won't forget that or at the very least I'll need it long before anything might happen to DS.
It would be useful if there was a car seat alarm that would go off if the car was turned off but there was still a child in it. I think someone was working on it or an app or something but it wasn't very good or didn't work 100% or something.