Almost every teenage girl I’ve ever known to get pregnant got pregnant on one form of birth control or another.
More important than giving them the false comfort of some prescription that promises to let them behave without consequences, parents should use these situations as life lessons in personal responsibility. And that seems to be exactly what the Palin’s are doing.
Bingo!
Today's low dose birth control methodologies frequently fail with healthy young women...many causes, including antibiotics, front ending loading, a half a dozen others. Doctors don't spend any time talking about it. Birth control methodologies are imperfect. Offering birth control to a teenage or twenties girl as guaranteed is completely bogus. The emphasis needs to be on personal responsbility just as you say.