Now I am NOT saying what Tim did was acceptable. But have you been following the Jason Patric court case at all? Do you understand how difficult it is for fathers to get access to their kids within the justice systems of the USA and the UK?
The whole system is weighted against them. It burns through people's money, savings, time, and energy... all the while the father often goes through years of no contact whilst lawyers fight out all the bullshit.
Many many fathers have resorted to suicide in such cases. It really is not as easy as you imply. Sorry to be abrasive, but I think you're a bit naive about how the system chews people up.
So I can understand Tim's frustration, and HIS mental deterioration over the divorce proceedings - which from what I can tell stretched out for a long time. I don't know all the facts, but it seems likely he could have make a case for diminished responsibility. Nobody sane tries to off the mother of his kids.