According to Norcross, why can't the claim of causal impotence justify eating factory-farmed meat?

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Norcross argues that even if we believe our individual actions cannot bring about a significant change in the meat industry, we have a moral obligation to at least try to prevent the immense suffering caused by factory farming. Additionally, by influencing others to also avoid factory-farmed meat, we can collectively make a difference. Ultimately, a morally decent person would refuse to support such a system, regardless of the perceived impact of their individual actions. Therefore, all of the choices listed above are valid reasons why the claim of causal impotence cannot justify eating factory-farmed meat.

According to Norcross, Why Can't the Claim of Causal Impotence