And, of course, that's nothing at all to do with a right wing press, owned, in the main, by billionaires, who have a vested interest in maintaining the current situation and, even, moving it to the right even more.
Indeed, had his own party not actively worked against him in well documented (but poorly publicised - that's a shock) fashion, there's every chance his "hard left"* policies would have won him an election.
(* Hard left, of course, meaning public ownership of essential services, taxing the rich and a working wage. Such extremism!!)
My grandparents (and several grand uncles and aunts) were reluctant Labour Party members from around the 1930s after both being in the communist party (like a lot of young working class people in the UK back at the start of the 20th century), they were reluctant because Labour were not left enough. Which was a constant refrain from my grandmother at each election I can remember her commenting on. She would have died laughing and crying that her constituency was one of the “red wall” constituencies that fell, her view was that you could put a red rosette on a pig and the town would vote for it.
Whatever the reason “hard left” (and no hard left does not mean what you define it to be - apart from taxing the rich the policies you mention have been policies of both the right and the left over the last 100 years or so) has consistently been rejected by the electorate at the election box.