Or...
No matter how good a parent you try to be, and no matter how hard you try to raise your kids right, the influence of pop culture and Hollywood can still undermine your efforts. Just goes to show how hard it is to be a parent nowadays with so much stacked against you.
There's a woman around here who's a leader in the local chapter of MADD. She has been for many years. One of her teenage children was killed in an accident a couple of years ago while driving drunk. Kids are known to screw up sometimes regardless of the information they're given.