Many people oppose capital punishment of criminals due to not wanting to kill an innocent person -even at the risk of doing a social injustice. These people are automatically in support of the pro-life movement. Pro-life people oppose capital punishment of pre-born babies due to not wanting to kill an innocent person -even at the risk of doing a social "injustice". Preventing the killing of innocent people- even at the risk of doing a social "injustice". The common goal of both groups.