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Lots of people use the pill and condoms (or whatever else) because they don't want to consider the possibility of pregnancy, and a 99.7% chance on top of a 97% chance is a .00009% chance (just going by memory for the actual percentages. Seeing as p<.0001 is considered statistically insignificant, it makes perfect sense.
Redundancy is teh best protection. That's why prisons have two fences and why I back up my data both onsite and offsite.
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