I'm vegetarian, sometimes I try to be vegan, for basically
every reason combined.
This doesn't mean I am unaware of the counter-arguments; disregarding the ones which are essentially just an appeal to tradition, there is still one more I know. To play devil's advocate:
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We have no idea at all what sentience is, and it's entirely conceivable that we're the only ones who really truly have the experience of suffering, rather than just a non-conscious stimulus-response mechanism.
By way of comparison, larger current generation AI are of similar complexity to the brains of many of these animals — are those AI sentient?
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Back to my own voice: I often find myself using the {animal brain complexity} ≈ {AI complexity} for the exact opposite purpose, to demonstrate why current AI might well be sentient.