I wonder if any of these anonymous posters realize a 'confession' of a crime is hardly enough to convict a person with.
It doesn't establish a guilty criminal "beyond reasonable doubt" because of how easy it is to give a false confession to protect a friend or to put Double Jeopardy into effect by the time the cops and feds figure out you aren't the actual perp behind a given crime. So... confessions are rarely enough to go to trial.
Frankly, if I killed someone because they abused me or did something I took violent exception to, I wouldn't bother with concealing my identity before confessing about it.
As it happens, I have nothing on my hands, not even a single drop of blood. Doesn't mean I couldn't take part in an event like this, but I've yet to kill or let anyone die from their own illness.