Ah yes but.. It's not about being able to "talk", it's about intelligence. What they're really asking here is "would we eat animals if they were as smart as us"? What's talking without intelligence, but "grunt" and "moo" and "meow"? And what if we couldn't talk, what if we couldn't disseminate hatred/love or religion/atheism, how does it pan out then? Would we still go to war if we were dumb? I think we would. Because there are other modes of communication than speech. And then we're back to the start, it's about intelligence not about talking. Whoops, I've gone and trapped myself in a circular argument...