The thing is they always have a logic or reference tied to them, regardless of how obscure shit is, even non internet pedo examples. It's what's led to a lot of absolute nonsense memes being framed as "far right dogwhistles" by retarded politics people the last decade. With a bunch of those you ask "why" and it's always "well see it was framed as one as a meme but is therefore an actual alt right dogwhistle because we framed it as one after finding out about the hoax one!" which is a lot simpler than the logic you'd need to describe some actual dogwhistle shit that's not fake and gay. Like the pedo ones seem to be a mix of actual co-opting of old memes and corruption of pre-existing concepts in really warped ways at times that make people actually start schizoing out because of how deep shit runs sometimes.