We've been here before but forgotten the lessons of the past: the manipulation of language to entrap; the witch hunt.
It's all there in that anti-semitism non-story.
I don't think it's that we've forgotten the lessons of the past, I think it's that most people don't get it, and never got it.
Winston Smith's last idealism was that he believed in the proles...Orwell knew that the proles, or today
the general public, aren't that arsed to understand stuff any deeper than what the headlines/telescreens are already telling them.
The media understand this, they know the constant drip-drip of associating something bad like anti-semitism with something good like Jeremy Corbyn will damage the good part. Floating voters, that mythical decisive element to who elects us, are arguably more swung by headline-propaganda than coherent analysis. i.e.
"I like Labour but that Corbyn's a wrongun, I keep reading about it so must be true."
Neurolinguistic programming via headline-media is, sad to say, quite influential. Corbyn's numbers in the GE 2017 were pretty good despite the campaign against him: shades of Trump's story which aside from obviously-different politics they do share an interesting similarity of having established media against them from the off. Trump's win rocked the boat in many ways, not least in how that media-driven neurolinguistic programming isn't as powerful as it likes to think it is.
UK folk need to heed that lesson from Trump's win: ignore the media and focus on whether they like Corbyn's vision or not (admittedly that vision does include his somewhat non-committal Brexit strategy), and vote accordingly.