Your argument lacks on two levels: 1. The same logic must be applied to condoms. They have a failure rate of 0.6 - 12% per year, depending on the study. 2. Yo

Your argument lacks on two levels: 1. The same logic must be applied to condoms. They have a failure rate of 0.6 - 12% per year, depending on the study. 2. You mix perfect-use with imperfect-use. Even sterilization doesn't have a 0% failure rate, because sometimes things don't work out properly. The perfect-use index of sterilization should be 100% safety, but in reality, it's 99.9% I think.