Imperialism.

One of the biggest effect of imperialism in the imperial core is that it pacify the working class by turning the existential antagonistic contradiction of class struggle into a non-antagonistic contradiction about which class gets to have the biggest share of the imperial plunder. Proles in Europe get to have “free” healthcare and education, and relatively high wages for relatively short workdays and workweeks, because the bourgeois can make up for the losses in surplus value by going to Africa (and other places too of course, but mainly Africa) and makes the proles of Africa work inhumanly long work days/weeks for almost nothing, and sell the product back to the rich European proles. In other words, the benefits and good wages and work-life balance the European proles enjoy are literally payed for by the exploitation of global south proles, these are the European proles’ share of the imperial plunder, and “leftist” European movements are merely about increasing that share, which, of course, necessarily implies continuing the plunder so that there is a plunder to share in the first place.

This means that, in order for European proles to stop being passive, the plunder needs to be taken away entirely. A revolution in Europe isn’t happening before they are fully kicked out of Africa.