Conservative philosophy in the US

I dont know how people who consider themselves conservative cannot sense the contradiction in their positions on abortion and the death penalty. If one feels that abortion should be banned no matter one would have thought that the same people wouldn't be proponents of the death penalty no matter what. However this doesn't appear to be the case. The conservative stand on birth control, abortion and the death penalty can be squared only if one sees that conservative people seem to be more driven by a distaste of promiscuity rather than on genuine concern for human life. It looks as though the whole moral "Christian" argument against abortion was brought in as an after-thought.