Ruler said:
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The definition of a parasite requires two (or more) living beings in a symbiosis from which one gains resources at the expense of the other. Humans usually have mutually beneficial relationships with most species we interact with. We eat cows, for example, but the cows have benefited from this domestication by higher population rates.
Nevertheless, his argument assumes that people put higher value on human life than the life of other species. I think most people are humanists and agree with such a sentiment. That doesn't mean other species aren't valuable, just less valuable than humans from the perspective of humans.