I'm a big believer in not rushing to judgement (or at least I try not to).
I have heard more than once of parents medicating healthy children to sedate them for plane flights so they wouldn't cause problems. I can understand the temptation to do that, but it still seems wrong to me.
Isn't that what they do to dogs that have to travel long distances to keep them from barking? The dogs I understand (if there is no choice but to transport them this way), but medicating a healthy child into silence SCREAMS that you are not succeeding as a parent.
I must admit that I tend to be a bit judgemental about certain aspects of parenting because many of the problems I see have the same very simple solution. Mommy and/or Daddy need to admit that they need help. No one has the answers to every question on any topic. Parenting is not an exception. If a parent needs help or a break, he or she should ask for it. If the parents in the original post had done that, their child might still be alive.