Technically you didn't call me it, but I got the inference from it.
That's the problem though. People shouldn't have to take the law into their own hands, but they do. Let's take the example of this guy. If he didn't do what he did, the crim's would have got clean away, after tying his family up and threatning to kill them, plus robbing them. What in any way is he contributing to our society? Nothing, he is a scourge on it and is better off dead as at least he can stop stealing other people's possessions.
About as relevant as you calling the public thick, just because your average Joe is going to be pleased that someone stood up to these scum, whilst people off your view point would want to understand them and help them, which is at the end of the day a waste of everyone's time and money.