Personally, I hold no ruth for Web of Trust (WOT). I played there for a while, but left when I could find no means whatsoever for redress. That came about because a couple of acquaintances, separate instances, were basically kicked off the Web by WOT. The only thing either of them did wrong was to make the wrong, vindictive enemies.
WOT is based upon the concept that [place your number here] people can't be wrong. Well, Hitler got elected - and many of those can't be wrong people changed their minds ... but that mass of folk were wrong by today's standards. The Salem Witchcraft Trials in early US were effective at removing folk, particularly women, from life - sometimes upon a single accusation that was supported by a jealous or vindictive populace [which couldn't, by definition be wrong].
WOT is just an example, as was pre-WWII Germany and Salem, of how a Wall of Shame can be corrupted and re-purposed. Be cautious in advocating/implementing such, for it is a very, very slippery slope.
Mind, I hold no ruth for spammers and their customers, either. But once established, a Wall of Shame is extremely difficult to tear down. However, it is very easy to corrupt from original intentions.