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Didn't you read the article? Go back and read it. Morning-after pills have no statistically significant effect on abortion and unexpected pregnancy.

Another lovely, elegant theory knocked down and trampled by a gang of brute facts.

I know it's counterintuitive, but let me tell you how that works:

Contraception has multiple effects, but let's look at just two: the physical one and the social-behavioral one.
the physical effect turns out to be the lesser of the two.
physically, an effective method (like a shot of Depo-Provera or the handing out of morning-after pills) can stop pregnancies individually in an isolated, temporary manner
socially, widespread contraception powerfully supports a society-wide junk-sex cultural change
the risk/cost of sexual intercourse is perceived to be zero (no consequences); the significance of sexual intercourse is perceived to be zero (no commitment, no recognized meaning, even no implication of romance, intimacy and trust);
before they even receive the contraceptive drugs, devices, and surgery, the girls have been preemptively indoctrinated with contraceptive propaganda;
this is not counseling: this is marketing;
in a developmental context, it amounts to sexual initiation;
training children in the practice and paraphernalia of intercourse is described differently in different contexts: when sexual predators do this, it's called "grooming"; when the schools do this, it's called "education"
exploitative sex, trivialized sex, junk sex, predictably rises;
whole age-cohorts of girls start having sex too young, to often, and with too many guys.

So the physical effect of the contraceptive campaign (a few females physiologically impaired enough to avoid pregnancy) turns out to be trivial; but the social-behavioral effect is so profound it easily raises the number of girls who will expose themselves to sexual risk. Resulting in more untimely and improvident pregnancies.

Take Bronx, NY as an example. The first birth control clinics were established there about 100 years ago by Margaret Sanger and her devotees. At that time, the abortion rate was "an appalling 17 per 100 live births" (according to Emma Goldman, who, though she was a feminist/ anarchist, was indignant about it, because she saw it as evidence of the degradation of the working class.)

In the subsequent years, the Bronx has been flooded by the availability of contraception. It has been sold, given away, advocated, urged, mandated, and almost universally approved. And the result? Bronx is the county with the highest abortion rate in the United States (48% in 2011) and one of the highest rates of nonmarital childbearing (65.7% for 2009, the most recent statistic I could find.)

And ---oh, gee, who'd'a thunk it--- completely predictable soaring STD rates as well (Link).

Read it and weep.