Over here, the first significant departure from the above was when the left plumped for Corbyn as Labour leader, not so much because of arguments made in the above manner, but because they held the Blairite consensus to be just another shade of Tory, and wanted "a genuine alternative". The decisive departure was Brexit, made especially effective because Corbyn was the leader of the other party, with virtually any outrage made possible because of the argument "Do you really want Corbyn in charge?". The manner of the arguments made by the left for Corbyn are practically identical in methodology to the ones made by Brexiteers.
There's a thread on here where I argue with the lefties on here about Corbyn, and there is the same disregard for evidence-based arguments as I pile evidence upon expert-provided evidence, only to be countered by meme-based arguments and keywords that apparently refute all arguments simply by being brought into play.
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