In my case, there was a structure of interest as a result of my father's background as a historian, and his teaching. The dialog and actions I became involved in were a result of the Viet Nam war. It was, I thought, a real cause, a non-hypocritical one. I was -- young. As you may remember from other diaries, the tear gas-goon squad incident was real, and it was me in that alley. That did it. Not suggesting that that's the only way. I do believe, however, that without empathy- the ability to sense and sympathize with another's joy or pain- any "left dialog" is hypocrisy.
If it's all just mechanistic word-play, symbol-chess, it's empty. Capitalism searches out the darkest corners of human potential, and mainlines them.
Emotional entanglement (empathy) can lead to just as vacuous a response, "You're starving? Let's have a Group Hug" as arid intellectualism, "You're starving? That means you're in the lowest economic status of your age cohort."
Both, carried to extremes, are mechanisms of Avoidance.