Personally I don't believe in the death penalty at all. Yes, there are sick, sick individuals out there who do the most unthinkable things to other human beings, including children. I don't condone nor support them in anyway. But an eye for an eye makes the whole world blind. Let them suffer in prison. Life without parole. Not kept in general population to enjoy the company of others. Secluded, alone and left to reflect and (with any luck) remorse over their crimes.
Not only does the death penalty cost an absurd amount of money, there's always that chance that the person could be innocent. I'm glad to come from a place where the death penalty no longer exists. I am not glad however that more often than not, life doesn't mean life. 25 years with half served for good behaviour is not punishment in my eyes. I think there's many areas of our justice system that fail and the introduction of the death penalty wouldn't fix those issues. Our prisons are too soft, often people return time and time again as it gives them a better life than they have on the outside. This shouldn't be the case.