Do you support egalitarianism and universalism?
If you do not believe that EVERY SINGLE INDIVIDUAL MATTERS, you have absolutely NO right to call yourself a true progressive left-winger.
The so-called 'meritocracy' is NOT left-wing (anyone in doubt needs to read Sir Michael Young's 'The Rise of Meritocracy'), and moreover anyone who thinks a large socialist government composed only of a small handful of (mostly privileged, most well-to-do) elites dictating and controlling every facet of political life over everyone else, is remotely in keeping with the egalitarian spirit most left-wingers believe they're signing up to when they support socialism, needs to think again.
We will only ever have a truly fair and equal society, when EVERYONE's voice matters, and when equality of outcome is treated as seriously an aspiration as equality of opportunity.