Most people with a so called "tortured soul," definitely think differently than people who are "normal." There have been recent scientific studies which have shown the connection between lower density receptors in the brain for dopamine (called D2 receptors), in the Thalamus, and high creativity. They have found other connections with dopamine and high creativity in other ways it funcions in the brain as well. Tortured souls just see and experience things others will never see or refuse to. I think they feel things differently sometimes and such deep and unavoidable sorrow, how can they not be able to put these extreme raw emotions to paper or music or whatever better than others might?
Not to mention the other proof. All the creative geniuses throughout history who were depressed, bipolar, or schizophrenic, a short list:
Edgar Allen Poe
William S. Burroughs
Not everyone who has been a highly creative writer etc. in history had mental illness of course but the fact is a huge number have.
P.S. Abraham Lincoln was a massive suicidal depressive, and I'm sure that's the only reason he is famous. Maybe they will make a movie about his life because of it.