The people who compiled the dossier did just that - compile a dossier. There's no law against it. There is no law against sending it to the media, it's up to the media if they act on it. No one held a gun to anyone's head as far as I'm aware, nor was Brenda specifically targeted but was one of dozens of anonymous tweeters, Brunt tracked down her identity himself. What exactly are you suggesting - that concerned members of the public, who are ignored by the police, should just put up with things, as the police have the final word on all matters? Tell that to the victims of the Hillsborough disaster, to child sex grooming gangs, and thousands of other injustices that have been highlighted by the media, forcing the police to finally get their arses in gear and act.
Yes Brenda was unfairly targeted. It was her doorstep that Sky turned up on. Was she someone with resources or a press team of her own to handle such intrusion? If we want to get into moral debates then there's one for you. Why did sky not want to doorstep some male 'trolls' or was an older single woman on her own an easier target?
Brenda's name was unfairly linked with other people's messages in the Daily Mail giving the impression that she was responsible for most of what was said. She was set up as a scapegoat.
The concerned members of the public in this case chose not to wait for the police to investigate, this is not the same as Hillsborough where police refused to investigate! Also Brenda committed no crime by expressing her opinions, so how was the situation an 'injustice'? How you can compare it to Hillsborough, I don't know.