Sports Guy Bill Simmon's Grantland Magazine (some kind of ESPN off-shoot) has published an article written by Bryan Curtis that tries to answer the question "Why is Indiana Jones and the Temple of Doom so dark?" Very interesting reading though I'm not sure I buy into everything. There were a couple of disturbing elements and the movie spends a long time underground but I didn't think it was that far off the mark. And compared to Indiana Jones and Kingdom of the Crystal Skull, Temple of Doom is a masterpiece.
Enjoy the article
Explaining 'Indiana Jones and the Temple of Doom' - Grantland