In old-fashioned terms this lady chose to write poison pen messages to a family who suffered every parents nightmare.
People who write poison pen letters must expect at sometime to be identified and to be prepared to face the flak when that happens. Remember she sent out 4000 offensive messages, some very offensive about the McCanns. Would we have been so compassionate if #sweepyface had been identified as a 25 year old unemployed loner?
The man who has been accused of killing Alice Gross committed suicide, should we be sorry for him? Do you not think that he had mental health issues? Hasn't he been denigrated by the press in his absence, even though, as far as I know, he is only suspected not accused and could prove to be innocent?
If you commit crimes of hate, whether poison pen or murder, you must be prepared to deal with the fallout. Committing suicide could be seen as wimping out, not prepared to face other peoples justified reactions but going for the sympathy vote by killing yourself. That could apply to Alice Gross's killer as well.