The death penalty is not intrinsically evil. The church has always taught that. Even now it is not intrinsically evil. So your post is correct...the Catholic Church did not condemn the practice of burning heretics.
Is your religion opposed to the death penalty?
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.