I keep coming across that cartoon and it bothers me because it is so one sided and one dimensional. It's not true that the left has moved further left. Possibly it might appear that way if you came of age during New Labour and you just want to shine a light on the past decade, but I go way back - does no-one remember the Militant Tendency?
Since the Blair years, the left has gathered a strange collection of ideas to its bosom (for example queer theory/trans ideology), reactionary ideas that piggyback on the notion of fairness and force-team T into LGB rights. These ideas have nothing to do with what I understand socialism to be: keeping a society healthy and functioning through some form of redistribution of wealth and resources, a fundamental idea of treating people equally.
That was Corbyn's major fail for me: he absolutely didn't get that to have a successful multicultural society everyone - everyone, with no exceptions - must be treated equally. The SNP have gone even further down that divisive and insane road to nowhere - juggling with so many people's competing rights, forgetting that the most fundamental division, shared by all people of all colours, sexualities and classes everywhere, shared by every single person alive (born of a man's sperm and a woman's egg), is the competing needs of men and women. If you don't start building equality there you're going to get nowhere. [Oops. Derailed myself. 😮]
As for the right, with the Brexit campaign, Farage and UKIP (as Adam said the BNP became UKIP and latterly Reform), the Tories have tried repeatedly to woo the voters they lost to UKIP back into the fold, and that means they have moved further and further to the right to accommodate them. They are performatively cruel (looking at you in particular Suella). It's bizarre. It's scary. The right has definitely moved much further right, which is not reflected in that cartoon that people keep posting.
Sorry to bang on - I've posted this before - but the idea I keep coming back to is crystalised in Adam Curtis' Hypernormalisation.
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I don't mean to suggest that Putin is destabilising us (though of course he is), I mean that as much as there's lobbying of our government by billionaire individuals and corporate interests, we ourselves are directly lobbied through social media and then again at arms length by the paid-for politicians posturing for us and wooing us.
In this context, when I look, for example, at the scenes in Edinburgh on Saturday, at TRAs drowning out women's voices, I'm angry. But I also think, these people are not our enemy. They're young, they're deluded. They should be demonstrating with rage because they have no secure housing, no secure jobs, no secure climate, world or worldview because they were born into late stage corporate cannibalism, reared with iphones in their hands. They are children of the state, children of the machine. They are deluded, brainwashed and confused. They have no context in the way that older people do.
I feel as sad for them as I feel angry. Anyway @DrSpartacular, I think the cartoon is one dimensional, and there's a lot more going on here.