Intentionally Stupid

Better access to contraception = lower demand for abortion. It's a measurable and obvious cause-and-effect thing going on. If you're against preventing the pregnancy, then you simply are in favor of keeping the demand for abortion high.

So how can these guys be in favor of sustaining the demand for abortion? Well, first and foremost, it gives them a way to keep abortion as a political weapon; but the kicker is that they can hide their cynicism in the fog of being "against ObamaCare". The politics of fear requires the maintenance of as many perceived threats as possible. If you allow any real progress towards solving even small parts of any problem, then you have to concede that government is in fact good for something; and you start to lose an important way to motivate your contributors and your voters.

There's also a pronounced element of their outright fear of sexuality in general, and the sheer terror they feel when they have to contemplate female sexuality in particular.