I don't think we can make that judgement without more data about how the house was set up, how close help was, and how far away the parents went. For example,

I don't think we can make that judgement without more data about how the house was set up, how close help was, and how far away the parents went. For example, going outside and down the street half-a-block for five minutes while your child is watching their favorite show is quite a bit different than leaving them working in the kitchen with knives laying around.