It made it hard for me to look at objectively
Killing children full stop. Doesn't bear thinking of, does it?
Maybe I am a cold bastard but killing is killing. I view all the victims equally and see the only relevance of some victims being kids pertaining to evidence of motive and ruling out any third party actions.
Killing the kids in bed rules out the idea of an intruder being caught and eliminating anyone who could be a witness. It establishes the murders as an assassination. Only Jeremy would profit from an assassination of the whole family including the kids. This is the relevance I see to the fact some victims were children.