Good question :)
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Most people imagine only female chickens which means the male chicks are killed soon after birth which is unethical
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Chickens eat their non fertilized eggs to recoup the nutrients it takes to lay them so stealing them has negative consequences for their health (eg fragile bones) causing which is unethical
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The idea itself that you can take something from someone else just because you are stronger or smarter and they can’t stop you is the mindset of an oppressor or a bully and is inherently unethical