As of today (subject to change, lol) I think he is innocent of the charge of malice murder. I don't believe he had any intention of harming Cooper, and that in fact he loved Cooper enough to stay in what clearly was his unhappy marriage with Leanne.
I also believe RH is profoundly immature, that it's likely Leanne felt as if she had to "mother" him as well as their son, and that RH resented her as a result. IMO his resentment of Leanne was likely what motivated his decision to not take photos of Cooper arriving at daycare anymore, beginning 2 weeks before Cooper's death.
Same thing about his complaints to online GF's that Leanne didn't like his going out to play, and for that matter, maybe resentment was what drove him to have online GF's to begin with.
In the two weeks before Cooper's death, RH stopped taking those photos, Leanne went home to visit family, and RH escalated his sexual contact with a 16 year old. I'm willing to bet it was in that timeframe he researched prison life, and that he did so because he was aware his sexting with a minor was illegal, but had no intention of stopping himself.
What I see is a RH becoming increasingly "defiant" towards Leanne, increasingly preoccupied with his online life, and increasingly willing to engage in increasingly risky behavior.
Imo all of that was about his unhappiness with Leanne, their marriage, and his juvenile response to not getting what he felt deserved at work, and had nothing to do with how he felt about Cooper.