When you finally go back to your old home, you find it wasn't the old home you missed but your childhood.
If caregivers are not healthy, mentally well-balanced and spiritually sound, then those for whom they care will suffer.
I do not want to go into its physical reasons: the construction of the human body is different from that of carnivorous animals. But man's intelligence is such that it can be utilised to defend any-thing he does, whether right or wrong.