I don't get this sentiment. Their child died because of their own gross negligence, and the father doesn't see any fault or remorse from their actions. They will do this again with their other children. They haven't been punished enough, because they still don't understand the consequences of their actions. If they showed any remorse whatsoever, I'd be more inclined to agree. Right now? No way. They deserve a lot more than they're getting. It's not a bloodlust thing either on my part... Sentencing should be both punitive and reformative. Slapping them on the wrist accomplishes neither.
The father has seemed to show remorse, but not for the right reasons. He still seems to think they did the right thing on some level. The remorse they seem to show is for the death of the child and the situation they are in. The both have said they would have done anything to save their child had they known what they were doing would lead him to his death. The problem is they still seem to, especially the father, believe in the nonsense healing. But I don't know if that's something we should punish people for.
However, Canada while still including things like punishment as a deterrent for other people in the legal system, I don't think we adhere to the ideology as much (you can see that here and in other cases).
The judge didn't just say house arrest and 3 months jail, he also told them to have hundreds of hours of community service, AND all their other kids are mandated to go to a proper doctor every three months for... I'm not sure how long actually, I imagine years.
That's the most important thing, as it protects the children who the judge feel get good care aside ideologically based from medical negligence.