In today’s New York Times, Ross Douthat opines that

a lack of contraceptive access simply doesn’t seem to be a significant factor in unplanned pregnancy in the United States. When the Alan Guttmacher Institute¹ surveyed more than 10,000 women who had procured abortions in 2000 and 2001, it found that only 12 percent cited problems obtaining birth control as a reason for their pregnancies. A recent Centers for Disease Control and Prevention study of teenage mothers found similar results: Only 13 percent of the teens reported having had trouble getting contraception.

If this makes any sense to you at all, imagine the same argument against requiring seat belts in cars as a way to reduce the number of highway fatalities:

Unavailability of seat belts simply doesn’t seem to be a significant factor in highway fatalities in the United States. When the XYZ Institute examined more than 10,000 highway fatalities, it found that in only 12 percent of the cases was no seat belt available to the deceased. A recent Centers for Accident Prevention study of highway fatalities found similar results: Only 13 percent of passengers killed in traffic accidents were in seats not equipped with a working seat belt.

Or the same argument against just about anything useful that should be readily available:

Unavailability of public waste bins simply doesn’t seem to be a significant factor in the litter problem in the United States. When the XYZ Institute interviewed more than 10,000 people who threw trash on the streets, it found that in only 12 percent of them did so because they couldn’t find a waste bin. A recent Centers for a Cleaner America study of littering found similar results: Only 13 percent of people who littered did so more than 20 yards from a public waste bin.

¹ According to the latest Guttmacher survey, released this month, and based on 2008 data, the rates of pregnancy, abortion, and births among teens in the United States are all at historic lows. According to the report, “A large body of research has shown that the long-term decline in teen pregnancy, birth and abortion rates was driven primarily by improved use of contraception among teens.”