The full post;

The death penalty is inadmissible because it is an attack on the inviolability and dignity of the person. The common good can be safeguarded and the requirements of justice can be met without recourse to capital punishment: effective systems of detention have been developed that protect citizens while at the same time do not completely deprive those who are guilty of the possibility of redemption. #NoDeathPenalty

Obviously, the Bible has enough crazy stuff in it that you can justify whatever you want. But these people are all very invested in getting angry over this post for some reason. It is like their "Christianity" is just about worshipping authority and giving themselves permission to do whatever they want.