Here’s how you can test whether you can be politically in favor of banning abortions, and support death penalty at the same time:
Step 1: Determine why you are saving babies. If it is on the basis that “all human life is sacred” then you cannot support the death penalty, given the fact there are non-lethal means of preventing a threat, as the CCC talks about. Even convicts on death row are human beings, made in the image of God just like the rest of us. Unless we redefine them as non-human because we presume they have behaved in non-human ways.
Step 2: If you do it on the basis of “all innocent life is sacred” then that leads to a problem. That problem is, that we presume to find some lives as “sinful” and therefore no longer sacred. In other words, we judge that a person is no longer worthy of living simply due to having been made “in the image of God” which was the reasoning we say in the first place, that life begins at conception. Once that happens we have a creature in the image of God. The law is here to protect the rights of citizens against others who would take them away – at the threat of up to and including deadly enforcement. So if an individual is removed as a threat, and we further desire that person die for his/her crimes, then we have made the decision that human life is only sacred until we say it isn’t. And guess where that leads to? Absolutely no clear boundaries.
Jesus hung around sinners all the time; apparently there was something about them that made their lives worth His time.