... Judging from The New York Times children’s best-seller list and librarian-approved selections like the annual “Best Books for Young Adults,” the bad parent is now enjoying something of a heyday. It would be hard to come up with an exact figure from the thousands of Y.A. novels published every year, but what’s striking is that some of the most sharply written and critically praised works reliably feature a mopey, inept, distracted or ready-for-rehab parent, suggesting that this has become a particularly resonant figure. ... Sometimes the parents are very, very busy, and sometimes they’ve simply checked out. The husband...