My firsthand experience with weed is that it causes severe nausea, incredible vertigo, chills, shaking, vomiting and did I mention the horrible, horrible vertigo and lots of puking?
My firsthand experience with weed is not indicative of an average experience, and quite possibly yours, Inkedu, is not, either.
Putting that particular dispute aside, though, I'll add that there is no evidence of his cannabis 'abuse' in the article. It mentions him smoking up once, in the whole thing, and even then, he mentions it in the course of what is probably a lie. So his statements about his use of cannabis are not reliable, since every other part of his story has been found to be unlikely.
Additionally, that sort of CONSTANT physical abuse of the child that they describe would require a fairly constant, solid high... if it had anything to do with the drug. Additionally, what goes up must come down; if the drug was what made him act in this manner in the first place, the natural progression of things would have been that once his mary-jane high wore off, he would have once more transformed into the loving, caring father that you seem to think he is and he would have gotten his child to a doctor.
He did not.
Additionally, I don't know if you followed the pathological info in there, but a lumbar spinal fracture is in the small of the back, just above the hips. Accidental injuries to the spine are usually caused by either blunt impact (like falling on your coccyx) or by the weight of the head yanking things out of place. A lumbar fracture -actual fracture - is extremely difficult to do.
To give you a better idea, a couple winters ago, I was going to grab coffee and stepped out of my apartment onto old-fashioned, solid granite stairs. I slipped on ice, and my feet literally flew out in front of me, such that by the time I landed across the steps, my feet were above my head-level, and I landed with the small of my back directly across the angled part of the step. I got the pointy part of a hard granite stair shoved into my lumbar region, with the force of a fall from, oh ... let's be generous and say a couple feet in the air, and I weigh solidly over 100 pounds... MUCH more than that baby weighed at the weight of a normal 6-month-old (she was undernourished and weighed the same when she died as she did at 6 months of age).
Even with THAT amount of force, with bones that are much stronger than those of a malnourished infant, I got one hell of a bruise, but I did not so much as slip a disc, let alone break my back.
This was intentional, deliberate, and malicious. It was not an act of paranoia, nor done out of ignorance. It was not a mishap. That child died in agony from the very deliberate act of someone who was supposed to take care of her. While her mother essentially stood by and watched.
Speaking of the mother, Inkedu, what is your explanation for her? Did she get high, too, and become paranoid about not calling the police on this man who was abusing her child? Did her paranoia induce her to skip doctor's appointments for the child? To ignore her father's advice to take the kid to a doctor about her arm? Please, explain that one.
Lastly, if someone is a 'cannabis abuser', this means they are not first-time users. In theory, this man knew the effects of cannabis on his psyche. Assuming you are completely right and not at all misguided regarding marijuana, he is still guilty of extreme negligence for partaking of a drug that he knows will remove him of his reasonable mental faculties while he is supposed to be caring for his child. Unacceptable. Inexcusable. The man should be severely punished. He is a monster.