This is a despicable thing to do, but let's not swing towards a reddit-style diet of stories which perpetually feed our sense of outrage.
An interesting adjunct to this is whether the criminals actually did -believe- a three year old would have a cell phone and be festooned with a headset.
Especially in LA, that might not completely crazy assumption.
I'm surprised this didn't happen in Florida (although LA would be my second guess)