Those are not the choices. Women do not abort because there are not enough adopters.
Liberal on evolution, liberal on homosexuality.
People claim to be liberal in one confined area. “Oh, I just believe this one thing about evolution, but otherwise I’m a hardcore conservative”, they say. Bull. Wet in one area, wet in others.
I know nothing about your background, but here's mine. I spent a good part of a decade fighting “theistic evolution” in the Christian Reformed Church caused by the Howard Van Till controversy. The local presbytery of the denomination to which I now belong, the Associate Reformed Presbyterian Church, voted unanimously to send an anti-evolution statement to the general synod; the biggest concern voiced was that the request didn't have enough “teeth” and should have been stronger. In other words, I have credibility to comment on the issue of evolution; I've done the fighting and I've seen the damage.
In theory I could agree with you. Social Darwinism, euthanasia, birth control, and abortion are all linked to a Hegelian dialectic from the 19th Century with seriously evil roots.
The problem is that many people don't understand those roots, and many others are inconsistent. It simply is not true that everyone who accepts some form of evolution also advocates baby-killing, zero-population-growth, and communist economics.
We need to be very careful that we don't assume that people think things through to their logical conclusions. That is especially true with something like evolution which is now commonly assumed rather than argued about. I think it would be fair to say that many conservatives who don't regularly deal with the fields of science or theology haven't thought enough about evolution to even raise questions about whether it is legitimate.
That is especially true in American politics where we have to get to 50 percent to win elections. I am not going to run around attacking the conservative credentials of a candidate who supports evolution; all that will do is make Republicans look ridiculous to people who should be voting for us. On the other hand, I'm perfectly willing to discuss the issues quietly and privately with someone who shares my belief in an inerrant Bible.