I don't see it that way
1. Opportunist paedo happens upon the boozing antics of negligent parents, snatches child, commits various nefarious acts, disposes of dead child.
2. Common or garden burglar / paedo stumbles upon the holy grail of apartments (see negligent actions of parents above), containing 3 unaccompanied children under the age of 4, steals child and nothing else, commits various nefarious acts, disposes of dead child.
3. Seasoned burglar / grifter / paedo receives tip off from criminal acquaintance regarding holy grail of apartments (see negligent actions of parents above), containing 3 unaccompanied children under the age of 4, plans meticulously on his own phone (for over 30 minutes) to steal child and nothing else, commits various nefarious acts, disposes of dead child.
4. Seasoned burglar / grifter / paedo / rapist receives tip off from criminal acquaintance regarding holy grail of apartments (see negligent actions of parents above), containing 3 unaccompanied children under the age of 4, plans meticulously on his own phone (for over 30 minutes) to steal child and nothing else, commits various nefarious acts, takes pictures / videos of, then disposes of dead child.
One of these ways?