I don't think people are coming up with reasons why it was better or worse than what it was on the surface.
I think people are trying to understand what was going on in this guy's head. It's what humans do. They see behavior, they classify it, and hopefully they learn from it.
Yes, he was torturing this kid. Yes, the kid died. Yes, he committed murder, and is now locked away.
But there are likely a dozen different reasons why he might have decided to take this path.
There are probably a dozen plausible reasons why he continued to take this path when he observed the negative effects.
It is reasonable to consider the possibility that he didn't understand that it was torture, and that it could lead to death. Why is it valuable to consider this path of reasoning?
It's because of the very real, and terrifying thought, that perhaps there are things we are doing to our own kids which may be torture and/or could reasonably lead to death that we are unaware of.
It's precisely the theory that stupid people are not aware of their limitations and inability to recognize their own stupidity that makes me want to understand why this person did what he did, and whether he understood the consequences or not, in an attempt to improve my ability to see the oncoming train if I'm too stupid to realize I'm standing on the track.
This case in particular highlights the gray area between knowing what will kill and what won't - even outside the spectrum of egregious child abuse.
So is it reasonable to wonder what was going through the guys head? Sure.
Is it reasonable to ponder the path that perhaps he truly didn't intend to kill the child? Yes.
Is there a possibility that he honestly didn't believe that he was doing anything more than causing mild discomfort? There's a possibility that it started out that way. Without more details we can't tell, though. If he was forcing liquid down the child's throat, then it's plain and simple torture and murder, and the first degree charge is justified. If he simply placed 16 twelve ounce glasses of water (which is 6 liters) in front of the kid, and said, "You can't play your video games until you drink all that," and the kid was motivated to consume it all (one glass per 7.5 minutes over two hours) and subsequently died, then suddenly things become a lot more murky.
It's not an attempt to excuse his behavior, or to undermine anyone else's arguments that he's a bad person. It's merely an exercise in trying to understand human behavior.
Regardless:
1. It's natural (and should be acceptable) to discuss possible mental state and the events leading up to it in an attempt to understand and come to terms with how someone could possibly do such a thing.
2. It should be blindingly obvious that in the absence of full case information, all we can do is discuss it with a variety of assumptions, all bad, but none any better than another.
3. Due to our various assumptions, the thread is ripe for miscommunication and misunderstanding. It's stupid to take posts too seriously when we're all operating on a different set of assumptions about this case.