You don't seem to understand - The thread is about Brenda Leyland. Not the others that might have stalked the McCanns.
Funnily enough Brunt went after Brenda rather than these 'others' that we are told issued death threats and engaged in stalking behaviour worse than hers. Then the police found there were no threats or stalking to prosecute. Why do you think that was? probably because there were no credible threats.
Wishing someone would suffer or saying you hate someone is not the same as credible threats, after all Kate McCann has done the same on a public platform.
I believe Brunt went after Brenda because he had been conversing with her on twitter, she give her real name away. Brenda's tweets were among those others who had been stalking and threatening the McCann's.
Credible threats were made, they threatened to kidnap the twins, to kidnap the McCann's and beat the truth out of them among other threats.
IMO the police didn't procecute because BL committed suicide. Suddenly they deleted their tweets and stopped the threats. Now though things are starting to go back to how it was.