We are not to be pro-life for some and pro-death for others. This is not what God calls us to do.
No one is suggesting this, are they? Pro-life means pro-life. It means we protect life, by killing those who kill if necessary. God said that the way we honor the image of God in man is by killing those who stamp it out. It is just retribution. However, it is the responsibility of the government, not some vigilante in a church service.
A society that is pro-life has to practice capital punishment as a way to protect life and show the value of life.
It's interesting that people on the streets know this. Around where I live, if you kill someone, there will be someone coming after you to kill you. Why? Because they understand the issue, though they have no theological basis for it. What is interesting is that those who should know God the best don't get this.
They think life is something to be frittered away.
But why was this guy in church anyway? It speaks volumes of hypocrisy that a guy who spends Monday-Friday stamping out the image of God then tries to salve his conscience by going to church on Sunday.