You know, we went around some of this yesterday and I kept getting bounced back and forth. Then someone reminded me that he said she called him and said "I did it."
His question, "which one?" She answered "All of them."
The fact that he would ask "which one?" is a clear indication that he knew it wasn't safe to leave her alone with the kids for one minute, much less one hour.
When I commented on how we haven't seen his grief, his rage, someone yesterday said "we don't know what he's like when the camera isn't running."
Of course not, it hasn't stopped running.