Don't mind me, just taking advantage of a good Marxist meme to plug my Read Theory, Darn it! introductory reading list on Marxism.
As the contradictions within Capitalism sharpen, more and more workers are radicalized and develop Class Consciousness, but without reading theory, this can be taken advantage of by opportunists. The Capitalist machine is very good at this, they redirect problems with the system itself to other areas, like immigrants, queer people, and more. Theory helps cut through that smokescreen and allows us to see how to move beyond Capitalism.