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A vegetarian lifestyle is undoubtedly the best thing from both a moral and a "save the world" perspective. PETA is right about that.
Unfortunately, PETA long ago jumped over the top in the same way that direct action environmental groups, anti-abortion protesters, and forced-outing gay activists did. Their message is either completely lost due to their outrageous tactics, or they are completely tuned out as a lunatic fringe, even by hardcore socially left-wing types like myself.
So PETA can rant and rave all they want, but it won't matter, because very few folks either listen, or take them seriously. Which is a shame, because the ultimate message is the right one.