That's how I feel too. I'm against the death penalty, all for treating prisoners ethically. But...
I wonder if I actually could, if I came face to face with them, but I feel as if I would happily inflict various painful injuries on them, which I won't describe as it'd get deleted. And post the video on all the pedo forums as a warning.
I hope they are tortured and terrified every day. I hope their lives drag on in abject misery and pain and humiliation and degradation, for years beyond a normal lifespan. I don't feel anything like that degree of malice towards many other people, but seeking out a tiny innocent baby who had no one else to take care of him, taking parental responsibility for him, and doing what they did. Life isn't long enough to punish them for what they did. I wish I believed in hell.
I am against the death penalty, but for this type of crime, where there's no doubt of guilt, I could be persuaded. But I'd want suffering for them too and prison is better at that. Grateful to all the violent, disturbed men who still have some moral compass and will take justice into their own hands in prison.