Surely Brexit has also taught us that trying to lump millions of people under one ideological hat is kinda foolhardy, as grasping exactly what kind of Brexit people want is next to impossible, so I'm not sure how we can possibly say that all Labour voters back Corbyn (or the Blairites). We can probably say that all Momentum members back Corbyn, but they, and indeed the membership in general, represent a tiny minority of the overall Labour electorate.
You are aware that there are socialists in this country, yeah?