Part of me wants to believe in revenge, just enough to vindicate the natural rage a parent feels even at the thought of harm coming to their children. But read this piece on the potential release of Michael Woodmansee and the statements by the father of his victim that if Woodmansee is released the father will seek out and kill him. And then definitely read the comments on the article.
I feel the gut-level urge to violent retribution as much as any parent. But I also can't see revenge as having any point here. And it doesn't strike me as helpful to dress it up as "justice." (Or as a matter of preventing the "monster" from striking again.)
The comments well-illustrate Socrates' remark in the Crito that the disagreement between those who believe that wrongs should be repaid in kind and those who reject this (as does Socrates) is fundamental and that both parties can do little more than despise each other.