It's not so much "walking away" as it is "learn from your mistakes". The general culture here at KiwiFarms skews towards not doing any dumb shit to people, but rather pointing at them and laughing. Them walking away and doing the dumb shit elsewhere doesn't really stop anyone from making fun of them, assuming it's in public. We have a lot of threads with people who tiptoe around KiwiFarms and talk about "hate mail" and "DMs" (perhaps most notoriously ArchivistBecks constantly uses this when she actually means her KiwiFarms thread).
On the other hand, you'll find that people like Allison Rapp just stopped saying and doing dumb shit in public and everyone stopped talking about her, because what is there to talk about? For all we know, she may not have learned from her mistakes as far as her general behaviour goes, but she learned not to do it in public, and that's enough for people here to just stop caring and leave them alone. Nobody wants to go out of their way to get laughs. We want them delivered.