On a practical level I'm not in favour of giving the state the ability to kill people, and yet in these cases where a person's guilt is incontrovertible, I find it hard to argue against the death penalty - without expensive, drawn-out appeals. Just sentencing and then execution as soon as possible.
I'm aware that even in those cases where the evidence appears incontrovertible, there might be a margin of error, but I find it statistically acceptable that a very, very, very small percentage of innocent people might be executed.
People will of course react strongly to that statement, but considering the number of people (including children) who die because their specific cancer treatment isn't publicly funded, who die because the mental health services don't provide enough care, who die because essential medical services are delayed by waiting lists, and other failures of the public health system, we are clearly fine with the state allowing innocent people to die.
So yes - I'm divided on the matter, but in principle I'm not against the death penalty for cases where the perpetrator is incontrovertibly guilty.