There is nothing wrong with the death penalty. There is something entirely wrong with burning to death those that disagree with you.
I would not be surprised that a Muslim would kill because of a disagreement, but I had hope Catholics had moved past this. Very sad.
Killing those who disagree with you is wrong? In a just war people are killed and it is not a sin. Perhaps your religion reserves the death penalty for murderers. That is not the current view in the United States (treason for example). The Catholic Church, as far as I know, does not say that the death penalty is intrinsically evil if it is used for non-murderers.