The machine's hard spots, are in the instruments of oppression. Those are well protected, defended by armies upon armies of class traitors and jackbooted fascists with guns. We can fight there, it is possible to struggle against those hard points and win.
But the machine's soft underbelly is the capitalist system itself. Its profit centers. Its ability to extract wealth. If you starve it of profit, you undermine its very foundations. And these parts are very soft, and largely undefended.