It's good to be a responsible person.
It's a hot day and John needs groceries and his two year old is in the car with him.
John wants to grocery shop quickly.
John takes his two year old with him to the store and shops quickly.
John leaves his two year old in the hot car and rushes to get groceries from the store alone.
His child does okay and John is still able to shop effectively.
His child could get very sick and die and John could get arrested.