Annoying Parents

When I dropped S off at school this morning, I was told that one of his classmates had a fever of 101.5, and that the teachers were unable to get in touch with her parents--i.e., the parents weren't answering their cell phones and weren't returning class. These parents make me so angry because this isn't the first time they've done this. How can you take your child to school with a fever? And I could look at the little girl and tell she was sick. She had the glassy-eyed look babies get when they have a fever. I don't understand this model of parenting. Her parents often do this, and their excuse is that they can't take time off of work because they just bought a house. I understand the financial need to work, but I don't understand not wanting to care for your baby.