Twain has survived his celebrity, as will Hemingway, and for the same reason: They wrote wonderful books. But both writers have been admitted to the canon despite the off-putting aroma of publicity that surrounds them. So certain questions impose themselves. Why was Hemingway, like Twain, inclined to present himself - or some versions of himself - to public view? Knowing the risks, as he certainly did, why did he take the chance? Was there something in the water he drank or the air he breathed growing up in Oak Park, Illinois, which drove him to seek not only accomplishment but fame?
Actually the sentence in bold is somehow unclear to me.
Dose it mean that why did Hemingway want to show himself to public view? and Dose "some versions of himself" mean: not always just in some period?