It wasn’t just about losing seats, Labour’s pool of the vote was down, even in seats they held, and at a time when the Conservatives are so weak they’re virtually flat on their back, in the worst state they’ve been for decades, so Labour should have made massive gains. If they can’t deliver a killer punch now when their opponent is on the deck, ripping themselves apart in a bloodbath, experiencing a crisis, they’ve got no chance. And that’s all down to JC and his stance on brexit. If this was about Blairite vs Corbynistas then there would have been swings to the Lib Dems in previous elections since Corbyn came to power including the General election held by May the other year in which the Tory majority was wiped out, but there wasn’t, because it isn’t about that, it’s ALL about brexit. Just about everything that happens in UK politics for the last two years has been about brexit. Nothing else gets a look in, normal politics is in a state of suspended animation, in a kind of chaotic paralysis. Similarly, old party loyalities are breaking down entirely as voters regard only their position on brexit.
As for your comments about the EU and equating the continent with more social democracy than anywhere else on the planet with neo-liberal, corporatism, well I’ve had that same argument on CD boards with many people on your side of the Atlantic many times and my general perception is most Americans are really poorly informed about this and just don’t get it. I don’t want to get into all that again here, so would just say just look at who it is who engineered brexit which is the Thatcherite, neo-liberal, pro-deregulation, pro-privatisation, uber-capitalist wing of the Conservative Party supported by money from US alt-right groups, heartily backed by Steven Bannon as well as far right populists, so it would be hard to see how such uber-corporatists would be against the EU if the EU was itself uber-corporatist, would it not? Nor how it would be a good idea idea for the working classes. Brexiters are big WTO fans, which is about as corporatist as it gets. It is generally a Conservative project largely backed by many of its voters. This link gives a useful overview: https://thebrexitsyndicate.com/
I agree with you in your estimate of JC, he’s an old school Bennite, whose ideas I agree with regarding public ownership and other policies but he’s alienating his voter base and support for worthy projects such as that, due to his being on the wrong side of the Labour fence when it comes to the EU, the ‘People’s Vote’ and brexit and it’s going to destroy the Party or his own leadership, I’d say within a year or so, unless he changes his point of view and stops the dictatorial attitude. You say Leftists should back him, it’s more that he should back other Leftists and his Party. He’s in an out-dated, 70’s time-warp regarding the EU and if he thinks post-brexit he’s going to be able to install socialist ideas and programmes in the de-regulated, freemarket, trans-Atlantic, neo-liberal, globalised, low tax economy that the UK–or what’s left of it after it’s fragmented-- will become, then he’s deeply deluded and unfortunately, he’s gonna take us all down with him.
Also, I’m not middle/professional class Labour voter, I’m working class, living in a post-industrial deprived area.