By Michael Nagrant He might eat foie gras on occasion, but even if you&rsquo;re an animal-rights advocate, there&rsquo;s no question that Mark Caro is a great human being.&nbsp; The Chicago Tribune scribe and author of the new book &amp;#8220;The Foie Gras Wars&amp;#8221; gave a reading at Borders in Lakeview last Thursday. He opened the affair [...]