If an innate tenet of parenthood is to protect one's offspring, why does Joe Simpson insist on repeatedly tossing his youngest child to the wolves? ADVERTISEMENT That's Joe Simpson, father of the alarmingly untalented Ashlee Simpson. Ever since her lip-synching debacle last year on ''Saturday Night Live," the pop star wannabe has been a perpetual punch line, and the disparaging words grew even more ferocious after her screechy, off-key performance at the recent Orange Bowl halftime show. By the end of her song, ''La La," a spectacular chorus of boos rained from what sounded like a good portion of the...