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As a general rule one shouldn’t believe in stuff that cant be proven.
what do you mean “believe in”? lots of people believe in economic theories that can’t tbe proven. some people believe in the goodness of mankind. everyone has some sort of myth (or likely many) that help them understand the world, regardless of how true or provable they are.
the vast majority of the soybean product that is fed to animals is the byproduct of producing soybean oil. feeding animals industrial waste is a good use of it.