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This is ignoring the fact that raising a cow for consumption requires ~10 times the amount of crops per calorie compared to just eating the crops directly. Also, I don’t think I’ve heard a single health expert recommend eating more beef - the universal understanding is that red meat consumption is generally a net negative in terms of overall health.
Ethics may not be fully objective, but claiming that they’re fully based on emotion is a ridiculous thing to say. You can make ethical arguments based in reason. Pointing to the war and saying “see, ethics aren’t real” is an incredibly naïve conclusion to draw.