I wonder if he was mad (grabbing on branches, cursing, flailing his arms) because he felt the pressure of a murder charge. I mean, if it was murder - and I think it was- he thought he had committed the perfect crime. I stated before that I thought he did it in a cowardly way (letting his child suffer rather than end his life quickly, leaving him to die via the elements vs his direct hand) and I think he didn't know what to do or have the criminal mind set necessary to improvise and cover his tracks. I too wonder if he was thinking of dumping the body in a dumpster. Perhaps he got cold feet- was worried about his acting performance? Maybe he was hoping someone else would discover the body and when that didn't happen, he started going to plan B? Maybe he was going to drive the car home and dispose of the body there? Maybe he freaked out when his dead son made noises?
I also was stuck by the eulogy. It was very negative. Every statement seemed to use the word 'not' and/or to have a negative connotation. Even the way she spoke of how she didn't anticipate this when he was born, how she wanted him and prayed for him but then had to face the difficulties of parenting. I, too, wonder if they were worried about their child having difficulties in life, for whatever reason (disability or whatever), because most parents are pretty positive and see the good things in their children. I don't think most parents look at a toddler and think, 'Yeah, we better end things for him before he gets made fun of, has no one to sit with at lunch, and gets rejected by a lot of girls...' I think most people think their child is special, funny, intelligent, attractive, and I think they hope and anticipate that others will see those traits as well.