The young man in question was neither accused nor convicted of murder. He was charged and found guilty of manslaughter. That means that no one thinks he intended to kill his child. In such a context character witnesses play an important role. Is this a young thug who acted on his habitual rage or a good person who was tragically negligent? The answers to questions like this determine what sort of sentence is appropriate.

Read what is written .

He was convicted of manslaughter not murder. I explained the difference in my post.

the result is the same , a child died . "oh , sorry , i did'nt want to murder him , only to shake him harshly untill he shuts up " If you have children , you probably will not "shake" them in a way they could die . That's not a human way , or yes ?