Brand new here and this is my first post! I have been obsessed with this case since the beginning. I wonder if he also felt he had limited time to commit the crime since Bella was going to start school soon and with her missing it would be noticed immediately? Although he doesn't seem like the sharpest knife in the drawer, it would show some premeditation.
He also did seem like he was hen-pecked and played a submissive role, so for him to assert himself in such a violent way is very interesting to say the least. The way he disposed of his children is so evil and callous, it is hard to imagine he was ever a loving parent. But on a lot of the video posts, he seemed like he authentically loved the children. He's a true Jekyll and Hyde.