Perhaps in a wider scale yes, capitalist society produces culture that reinforces its own ideology. But there's disagreement among the capitalists, some of them want to exploit more thoroughly to get as much money as they can right now with no regards to long term sustainability, others see the writing on the wall and care enough for their own legacy that they are willing to make temporary compromises in the interest of longevity. In that latter class of liberalism there's space for genuine criticism of the former. It isn't truly subversive as you said, it's infighting, but they are still capable of sabotaging each other. That's why the state exists after all, to stop capitalists from tearing society apart for 5.1% growth in revenue in the third quarter.

E: Also, put some respect on Parasite, and read rule 2. Wouldn't want to need to ask you to post some hog.