There is a great difference between informing the community about scam and scammers, and continually trying to link alts, without proof, and even when the said alts haven't broken any forum rules. With exposing scammers you are saving forum members their money, and warning them to be careful so they will not lose money, as for linking alts, it may not be a bad thing if you have strong evidence that they are cheating, but to continually link alts without evidence, and without them being responsible for breaking any rule, may be ruining member's reputation when they haven't done wrong, and the 'alt hunter' is not being helpful that way at all. Though going by DireWolf's post history, it goes without saying that he is not 'scam hunter'.
If the evidence is strong enough, then will the accused person even have to defend themselves before action against them is taken? But if the reports have so much doubts, and the evidence is weak and still needing the accused to defend themselves, then should the report ever have happened. I feel people can decide whether they want to talk about someone's accusations against them, or if they want to ignore it and do other better things with their time in the forum.