You already answered the question. The claim is you shouldn’t talk to strangers. The support theme shows that in the evidence because little red riding was too trusting of the wolf, the “stranger” she ended up putting her grandmother and herself in danger.
Hemingway was driving an ambulance in Italy not because he had been injured or because he was a doctor, but because he was assisting the Red Cross on the Italian front.
Hemingway first served in World War I and later lived in Paris. He also wrote A Farewell to Arms after the war and drew on his personal experiences to do so. Finally, he retired to Key West.
Hemingway's writing style was anything but commonplace or boring. In fact, it was the lack of wordiness and the creative succintless that made Hemingway's works so popular.