Why does tom mention for the second time that the joads weren't people to write?

Tom mentions for the second time that the Joads weren't people to write to emphasize their struggle and the harsh realities they face. It underscores the idea that their lives are not defined by narratives or stories traditionally told; instead, they are caught in a relentless cycle of hardship and survival. This repetition highlights the disconnect between their lived experiences and the broader societal narratives that often overlook or misrepresent them. Ultimately, it reflects the weight of their hardships and the desire for their truths to be recognized.