Looking at schemes like the "living wage" movement, it might be tempting to think that the Left was interested in reforming capitalism. A closer look reveals that this isn't the case.
If reform was the goal, you'd see the left investing its considerable resources to create banks, large corporations, and small businesses (like restaurants), and to run them according to the best progressive principles.
We don't see that at all. Instead, the Left does nothing but make crippling demands of existing banks, large corporations, and small businesses.
The left doesn't want to reform capitalism; it wants to destroy capitalism, and make paupers of us all (except the governing elites, of course).
If I'm wrong, I'm open to hearing the evidence.