A vigilante meets out extra legal punishment, nobody has been punished, it's just been pointed out by a lot of people that they need to be. Due process didn't work several times in this case because the Police were implicated and failed to investigate properly. Due process generally doesn't work when the system is infected at a high level and there are lots of careers being controlled by the source of the problem. The Prime Minister knew that his director of communications, who has now been arrested, was criminally implicated in this before he was elected a year ago and he was too scared of the tabloids to do anything about it. I think you need a public protest in these situations. Note: that Protest != Violence.
