The Mccann's weren't on twitter but there were nasty abusive trolls on there who were supporters so IMO Brenda was abused and from what I have read their stalking of her was outside twitter rules and IMO the rules of decency.
Yes Brenda was nasty but she did not deserve what she got whatever others say.
What makes you think that the dossier hasn't hit a brick wall and been ignored by the police as not construing evidence of a crime. They say there was no crime so are they lying?
In my opinion Brenda was the architect of her own misfortune and using her death in a blame game is inappropriate.
She had no intention of easing up on the McCanns.
SnipOn 17 September this year she tweeted what might have amounted to a personal manifesto: to make the McCanns "live in shame".
A week later, on 25 September, she sought to justify her hatred of the McCanns:
https://www.buzzfeed.com/patricksmith/read-the-deleted-tweets-brenda-leyland-sent-the-mccanns?utm_term=.yvz8WRW8e#.ekNbxQxbjIn real life Brenda Leyland was probably neither a saint nor a sinner but on the internet her obsession with the McCann family became legend.
The really sad thing about it all is that no lessons have been learned from the whole episode as I believe the abuse of that family continues apace.