The most common (or at least most advertised) opposition to abortion is rooted in the personification of the cell mass that results from a biological process, or perhaps the perceived humanity of said cell mass. Many anti-abortion supporters feel that it's wrong to "end a life/potential for life".
Once all the personal feelings are taken out of the issue, there is no longer any reason to object to (first trimester) abortions any more than there is reason to object to corrective eye surgery or mole removal.
These two ways of thinking are very similar to the differences between how theists and atheists see the world.
1: Prenatal personhood is entirely logical even when emotion is removed.
2: With no religion to bias them either pro or anti, atheists would likely be 50-5 on abortion. However, with many religions being anti-abortion, many atheist reject prenatal personhood along with everything else linked to religion. This contributes to the pro-abortion atheist crowd, putting more pressure on anti-abortion atheists to change.
......and funding programs for actual sex education that works in the real world rather than deny deny deny refuse obfuscate and then try to bury all the scientific research that shows abstinence only "education" doesn't work. yeah, i think you're on to something there doone. :)