Whether they did this for the sake of their own type of vigilante "justice" or to feed their sick urges, i find it hard to agree with what they did. Whether the victim was a model citizen or a convicted child rapist, i just cannot agree with such behaviour.
I can bet many people on this thread will see no issue in this mans murder, but in my opinion its maintaining compassion towards human life even in the most difficult of circumstances that makes us civilised people above those who commit such heinous crimes. I don't even know what to say, regardless of who the victim was, i'm still utterly disgusted by this.