All moral tradeoffs are messy. However, on some fairly modest ethical assumptions, when a severe and irreconcilable conflict of interests occurs, then the interests of the more sentient take precedence over the less sentient. This rule of thumb holds regardless of the age, race or species of the victim.
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Reply to "Why is David Pearce a vegan and a negative utilitarian given industrial agriculture's decimation of insect populations and, therefore, suffering the greater number of insects than farm animals? Shouldn't insects outweigh farm animals?", Quora, 3 Sept. 2019