Assuming that you're referring to the no name-and-shame rule;
Except it's not a serial killer. It's a person who the OP claims to have behaved poorly in a video game.
To which I add;
"Hey everyone! I want you to be on the lookout for afmghost, he was being a complete asshole in one of my games on my alt."
Now regardless of my claim being true it would mean that you would need to defend against it. Imagine if you weren't on the boards to defend the claim?
You have no right to additionally try to get the community to harass out of vigilantism because there is already a system called reporting them that gets the situation through the proper channels.
Finally, any hope that I would randomly run into any player that you attempt to publicly shame is negligible. It would be like sending a message that there was a shoplifter at large to everyone in new york city.