That is one on which we will have to agree to differ. It is worth stressing that I don't think of anyone who wishes death upon a criminal as an awful person. Just wrong about the concept of justice. The best way of putting it, I think, is that if ever I caught someone who killed someone in my family myself, I'd not be surprised if he ended up dead if I had the chance to kill him, if I didn't have the time to think about it. But justice isn't really about an equal trade, in my opinion. It should be about catching and condemning the accused, free from angry, but totally understandable, emotional responses.
What I find frustrating is how people who try to be dispassionate about justice get so much bile for doing so. We aren't "lily-livered liberals" - and you aren't "angry hate-filled violent yobs" either. We just disagree about how justice should work.