That's true, and that is why I have an emotional reaction when I see the commission of a heinous murder.
In the states, family's victims can watch the guilty be executed. It ideally provides some closure, says the government. In one sense, I agree it does. On the other, I feel there are more healthier means to bring closer without revenge or needing one's pain be put on another because of their hurt.
It also reminds me back in the times where criminals were literally sent to the lions and people all around cheered. Other times people gathered to watch criminals heads be chopped off and smile in laughs as if they are absolve from such acts.
That's the emotionalism I get in my head when I think of revenge. I don't remember even taken revenge my whole life. Even if I thought about it, say something stupid like talking about someone behind their back because of X, I stop myself and just think that's not who I am. I just leave it alone. I can't imagine why people would smile and support such a thing. I really don't.
Just my last thoughts... it really makes me said. Its a double standard more than anything else and I don't see crimes justified on either side whether its called justice or murder.