Parents that make excuses for their kids being absent and/or don't complete homework like to blame the school system. In this case, the school places the blame where it should go... to the parents.
Since my daughter just turned seven, I won't have to deal with this for many years. But parents with teenage daughters have been going through this cycle since time began. It's a life-changing, sometimes painful subject, and like it or not, Aunt Flo will make her appearance sooner or later...