I think we're supposed to get mad when we hear about these kinds of things.
Here's the deal, nobody in this conversation can forgive that man for murder. Neither can his wife or children.
What has that man done bad to you or I? Whatever he has done to you or I, would be the only thing he can seek forgiveness from you or I for.
Forgiveness is important, but there are consequences for our actions. In the 10 commandments, half are geared toward God and the others toward one another. Both are equally important.
I pray nobody close to me gets brutally murdered. It angers me that this man thought so little of human life that his own selfish ambitions would cause him to reason away his own offspring and who was to be "flesh of my flesh, bone of my bone". It was a selfish, self centered act and unlikely to be rehabilitated. Personally, I would support the death sentence in this individual case.