I'm not. For me personally it is 99% about not harming sentient beings. Plants are not sentient beings. I kill them and eat them routinely, as do you (assuming you aren't a fruitarian). I get your point that animal food wastes more plant life than killing just plants as a direct food though.
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Porifera (sponges) were the first multi cell animals and if you believe in evolution (and the current DNA evidence supports a single common ancestor to all animal life, according to that previous link I gave) then this is our family tree:
Notice all life is descended from the evil, gobble-you-up character from Ms Pacman^
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