I think you have just shown why the Left will keep losing elections.
Do you have the correct diagnosis and the recipe to save the European Left from disaster? It'd be a good thing to know both. Out of irony, it'd be good a comeback of socialdemocracy... or a reinvention which doesn't imply losing its former spirit into some kind of third-way socio-liberalism or, even worse, a carbon-copy of right-wing xenophobic populism. I wish to see tyranny overthrown one day, if possible.
Few people care about being "correct". Offering that sort of dry, bloodless argument simply does not persuade your average voter, and the use of academic jargon only makes it less compelling. Before people can believe in your position, they have to believe that you believe in it.