There was an article i read about 2 parents who left their 2 year old kid in their house alone. The 2 year old son was found outside at 10:30pm dirty and sweaty. The child had been locked out of his house in 96° weather with no water. When the police contacted the father and told him about his son, he had just responded with "Whatever" and hung up on the officer.
I think this is total bullshit that they decided to leave their son home alone just to go play pokemongo, because they could have either gotten a babysitter, taken the baby with them, or waited for a more appropriate time.