You're somehow connecting the 2% failure rate of condoms perfectly used with the fact that 54% of women having abortions were using birth control. Perhaps some of the women using birth control were using the withdrawal method or periodic abstinence, much less reliable methods. IAC, NO ONE is perfect, but even if a woman COULD be perfect, there would still be failures. After all, IUD's and sterilization do not depend upon diligent application and yet women still get pregnant.